Swap a Modern HEMI Into Your Classic Mopar with Mopar’s New Crate HEMI Engine Kits

1. Will these crate engine kits work in a 1987 Ramcharger?

   I know the article says 1975 and later.

   Just would like to drop one in

   • Hello, yes it should! FCA actually put a 5.7L Hemi into an older CJ Jeep!

2. Will a 6.4 Liter drop into a 1948 Desoto Custom? What transmission would you recommend? Thank you.

   • That’s a tough one, Arthur. Thankfully, the bellhousing bolts will fit all LA small block transmissions, so you can snug up a 904, 727, 4-speed or a modern Tremec. There’s also Silver Sport Transmissions’ A41 overdrive automatic too.

3. would this me able to be put into a 1980 jeep wagoneer? what all would i need as far as parts? motor mounts?

4. Is there a cheat sheet on installing a 6.4 hemi into a 1970 roadrunner?

   • A cheat sheet? No. But there are late model Hemi swap book(s) available.

     • Where can I find one of these late model swap books?

       • Click this link: http://cartech.web2market.biz/

5. Looking to upgrade my 1967 Barracuda convertible from it’s current 225/6 904 automatic and 7.25 rear end to a 6.4 setup. Can I use the existing transmission and gears with the new block? If so, will it just bolt up to the current transmission, or would that require modifications?

   • The modern 5.7, 6.1, 6.2 and 6.4 engines have a bellhousing pattern similar to a small block/LA motor. Unfortunately, it is very likely that your new 6.4 is simply far too powerful for your current stock setup.

6. My 1970 Plymouth Cuda came stock with 383, would this setup work? I also want to use modern transmission, any recommendations to pair a modern Hemi and transmission to fit in engine bay of the 70 Cuda?

   • There’s a LOT that goes into dropping an late model EFI engine into a classic car. Getting the new 8-speed TorqueFlite is also a HUGE endeavor that custom shops are struggling to figure out. There’s quite a bit of floor cutting to get that new tranny in too.

7. I have a 1968 charger base model and was wondering if I could upgrade to a 392 Hemi? how would that work out?

8. Want to put a new crate engine 5.7 in my 70 cuda what transmission do you recommend

   • Seeing that the bell housing bolt pattern is that of a 904, I strongly suggest either an American Powertrain or Silver Sport Transmissions 5-speed manual transmission kit.

9. I have a 1970 Dodge Charger that has a 440 and 8 3/4 rear end. I would like to Put in a 392 Hemi and keep the beefed up 727 to avoid floor cutting. Is the 727 with 2500 rpm stall, shift kit, and extra clutches OK? Does the 392 require cutting out any any other parts of body ?
   Thanks

   • The problem is that the 727 bellhousing bolt pattern DOES NOT line up with the new 6.4L Hemi. A 904 does, but not the larger 727. There are adapter plates, but they’re thick and throw off the conversion engine mounts and/or the transmission cross member. The long answer is that it’s gonna be a HUGE pain in the butt.

     • Hey Kevin, would a 727 with the LA pattern bell fit a new hemi

       • Yes, the LA/Magnum bell housing perfectly lines up with all G3 Hemis.

10. Hi
    I am the proud owner of a 1968 dodge sweptline crewcab. I just picked up a 2017 ram 5.7 with 8 speed trans and transfer case. so my obvious question is how or where do i get this kit.

    • Clearly through Mopar, but they’re tremendously back-ordered.

11. are your kits available for the 6.1 hemi

    • We’re a magazine, not Mopar itself. And you’ll see what engines are available in the hyperlinks in the article.

12. I have a 69 Dodge Cornett want to put a 6.4 hemi into it what overdrive transmission can I use

    • Understand that the bellhousing bolt pattern is identical to a 904, so your choices are limited. If you’re looking at a manual 5- or 6-speed, your choices are American Powertrain or Silver Sport Transmissions (the latter is designed with a factory center console).

      For automatic, Silver Sport Transmissions offers their A41 4-speed overdrive with an adaptive bellhousing.

13. we have a 1971 duster and will be putting in a2015 hell cat 6.2 sc with it automatic transmission any one done one need front end info for motor mounts can front end be brought or better to build one

    • You’re not going to want to run that 8spd. auto. You’ll hamstring yourself with electronics and frankly, will have to gut your floorpan and crossmembers.

14. I am doing a rotiss resto on a 71 Challenger. It was a S. D. Car and no salt rust but sat in tall grass a while. Got all the replacements welded in and purchased a used 2006 Charger 5.7 with a 5 speed auto. And everything associated with the engine. Car was in a easy rollover. The seller started car, removed everything, wiring, all harnessing, 12” of the 3 In. Exhaust tubing so all sensors are on exhaust. The electronic gas pedal, shifter, all accessories are there. Looks like all I need to replace is serpentine belt. Of the listed parts, I think I need the chip that isolates the engine only as i hope to use the cars wiring. Is this possible and if so what and where Do I buy it. Also where is the books listed that you say are available. Appreciate if you could email answer or message me. 1stealthcar@gmail.com, Ron Langevin.

15. Hello Kevin,
    I own a Dodge Ram 1500 Laramie with a 5.7 hemi. I want to swap it with a hemi from 2010. Is there anything to I have to need to change or is it one easy job?

    Best regards Peter Huizing

    • Physically, it shouldn’t be a problem swapping the engine itself. What you’re going to encounter is MAJOR engine management issues. The FCA hardware isn’t going to “play nice” with your truck’s existing hardware. The software won’t jive either. You’re better off just upgrading your existing 5.7L Hemi with a tune, exhaust, and other performance parts.

16. I’m sorry,
    Is there anything major I need to change or is it a easy job?

    • It’s going to be a nightmare. Especially when it comes to computer management hardware and software. Your older Ram will not communicate with the new FCA engine management software.

17. I am thinking of putting in the Mopar 392 Crate HEMI Engine in my 1968 Charger. Can this be done for under $100,000?
    Thanks. Joe

    • Oh goodness, yes! Both Holley and Edelbrock sell standalone wiring harnesses, as well as Mopar itself (although not a classic/modern swap-friendly).

      The G3 Hemis have a small block (LA) bellhousing pattern, so note that you’ll want to consider beefing up a 727 TorqueFlite or manual trans (or swap to a modern 5 or 6 speed Tremec through Silver Sport Transmissions).

      The hard part is that the G3 Hemi requires far more voltage than the factory wiring harness can handle. The ECU, EFI and engine management sensors require 14amps at all times. This means you’re going to need to replace much of your Charger’s wiring.

18. I’m seriously considering replacing the 440 in my 65 Satellite with a 5.7 Mopar crate engine. I would prefer to retain the 727 and install a Gear Vendors unit behind it. What if any suspension modifications will be necessary front and rear. I am needing to replace my steering box with a new Borgeson unit regardless of the engine swap but want to budget wisely for the ultimate Gen III swap. I am anticipating that I will need to completely update all of the original wiring to work with the modern electronics for the new drivetrain. Any suggestions and recommendations you can give me to help make this project as efficient and cost effective is greatly appreciated

    • Mike, you’ve got bigger problems than just suspension. The ugly little secret that NOBODY talks about is the need to completely rewire your car to handle the necessary constant 14V needed to operate a new 5.7L Hemi. The electrical system in a classic Mopar (until the mid 1970s) was the weakest link, and the strain on the factory harness will likely cause a domino effect of failures that will having you hating yourself and your car for years.

      Of course, your radiator, fan(s) and transmission cooler will not work either as the coolant hoses are in different locations. Holley has a new series of aluminum “Frostbite” radiators that are made in the US which I like. You’ll want to give them a call.

      Now, if you’re ready to extract ALL of the factory harness with a Painless or American Auto Wire kit, change to a one-wire alternator (thus losing use of your factory ammeter), then we can proceed.

      G3 Hemi swaps don’t require changing the steering or suspension whatsoever. Motor mount kits are available through Schumacher and Mancini Racing. Obviously, your headers/exhaust will need to be changed as well.

      The G3 Hemi bellhousing accepts all SMALL BLOCK bellhousings. A Chrysler 904 or TorqueFlite 727 (again, for a small block) will work, as will your Gear Vendor. This means that NO! your big block 727 will not mate to it.

      Sell the transmission you’ve got, source out a small block TorqueFlite and have it built to spec.

      The G3 Hemi weighs quite a bit less than your 440, as will the smaller transmission, so you’ll immediately feel the difference in your Belvedere’s power-to-weight ratio. But unless your 440 is a lazy dog, you’re looking at quite a drop in horsepower.

      • Kev in,

        Thanks for the prompt response. My car was an original 318, automatic car and the 440 in it now is no slouch. I am really looking for drivability and reliability as I am hoping to make the car my mostly daily driver and have it perform similarly to the 2006 Charger Daytona I regrettably sold. I can easily change the existing Edelbrock carb to a FI-Tech EFI setup and then just add the GV to get the overdrive gearing. Either way I am expecting to completely upgrade the car’s electrical system because it is definitely the weak point that keeps me from driving the car more than I would like. It sounds like I would need to go with a 6.1 or 6.4 Gen III if I decide to go ahead with the swap.

        Thanks again,

        Mike

        • Mike, although I’m 100% all for late model Hemi swaps, seeing that your car is a strong street machine, I would STRONGLY recommend the FAST EZ-EFI 2.0 electronic fuel injection system rather than uprooting your entire car. The EZ-EFI 2.0 not only replaces the carburetor with an 8-point EFI throttle body, but also provides a computer-controlled billet distributor and electronic ignition system. You keep your engine, trans, Gear Vendor, and wiring – but you get ALL of the driveability of a new G3 Hemi. Please read this article: https://moparconnectionmagazine.com/gallery-modernizing-your-mopar-with-the-fast-ez-efi-2-0/

19. I have 72 duster, other than wiring, is the 5.7 Heim swap drop in. And would a automatic or manual trans be the easy way to go

    • It should drop in, you’ll obviously need a set of motor mounts and a new radiator.

      The transmission is a matter of choice. Silver Sport Transmissions has a modern 5 or 6-speed manual Tremec swap. Otherwise, you’ll need to find a 904 or 727 for a LA motor.

20. I’m interested in doing a III gen hemi swap on my 74 Ramcharger. I’m running a 360 now and wanting something different. any suggestions do’s and don’ts? Just looking to get a grasp if its worth my time.

    • Ideally, keep your LA-pattern transmission. I’m not sure about motor mounts as Schumacher only has them (to my understanding) for cars at this time. The biggest issue is electrical. Not only do you need far more juice to operate the ECM, but a mightier alternator to feed it. This means almost completely rewiring your truck. 12V ain’t gonna cut it.

21. That’s the biggest thing to most guys. The wiring. Like why can I get anything for a now older gen3 but can’t get a 2014 vvt motor up and running for the same or less than I paid for the whole engine.

22. Kevin,

    Just for clarity, the GenIII electronics do not run on 14 amps, it 14 volts. Voltage and current are 2 totally different things. 14 amp into those sensors would probably burn them up.

    • Yeah, that’s an egregious typo. That’s on me.

23. Do you know if the rear sump oil pan kit, will work with a 68 Dart using a 2014 5.7 engine with stock K member?

    • The Milodon oil pan and pickup kit, and a good set of conversion motor mounts, should permit an easy installation.

24. Hi Guys.. I have a 2016 392 that I want to put into my 1972 Dart “Drag Week” car. I am thinking of using a NAG-1 trans with the 8 3/4 diff. Any thoughts on this combo? Thanks in advance…

    • If I could say anything, it would be to convince you to NOT do the Nag-1 trans. They’re horribly problematic, you’ll completely gut your floor/cross member to get it to fit, and right now, there’s little in the way of TCM controllers.

25. not sure if this is still open for discussion maybe someone can point me in the right direction. I am installing an 04 hemi and tranny out of a rumble bee. Into a 1974 barracuda. I have been collecting parts and working for 8 years . I bought a wiring harness from Street and Performance and unfortunately Mark Passed and the business closed down as I am told. The car goes in to limp mode as soon as you nail it I wont go in to the details and waste everyones time if I am in the wrong place. simply I used an 03 drive by wire which was mounted under the battery and they are notavailable anymore . Any suggestions on what to swap with and how to wire would be great

    • Willie, man you’ve got some trouble on your hands. Personally, I kinda wished you hadn’t gone with the 46RE transmission, as that typically is a source of grief. Seeing the car is running, you’re likely looking at a software issue, not a hardware one. Strongly recommend not “throwing the baby out with the bathwater” but find a qualified tuner. The best engine tuning shop who uses HP TUNER software will be your best bet. Do some searches on Google to find a HP TUNER-trained (that’s the name of the software brand) engine tuner. They’ll be able to diagnose and resolve your issue. Easy peasy lemon squeezie.

26. Would any of theses Hemi conversion kits be adaptable into a manual transmission Crossfire.

    • Are you asking if you can drop a new Hemi into a Crossfire? Ugh, why would you want to? That would likely take YEARS to retrofit.

      Otherwise, you’ll be very hard-pressed to find a bellhousing to adapt the two together. Just go with an American Powertrain or Silver Sport Transmissions’ bellhousing and Tremec 5 or 6-speed manual.

27. Hi Kevin, First I want to thank you for all of your work on this post – the info has been valuable.

    I have a 65 sport fury convertible that I would love to put a Gen III Hemi in. What engine/trans combo would you recommend? I don’t want to over do it so to speak.

    • First, thank you. Second, when most folks consider swapping in a new Hemi into a their classic Mopar they’re thinking “it’s gonna drive like a new car.” Unfortunately, that’s really not the engine’s doing – it’s the rest of the driveline. A modern EFI system and a hydraulic roller cam swap will smooth out your engine’s rougher edges – all while still maintaining plenty of horsepower and greatly improving driveability, ease-of-starting, and overall enjoyment. (It kinda sounds like I’m talking you out of a swap, huh?)

      A smooth shifting automatic or a nicely synchro’ed manual with a few extra gears is really the thing that makes the big difference. Lag-free shifts with zero slop can make any classic feel like a million bucks, regardless of the engine. If you’re a manual guy, go with a Tremec 5-speed swap from either Silver Sport Transmissions or American Powertrain. SST is a little more mild and designed for the guy looking to still use a factory center console, while APT is a little more geared toward the autocross/roadrace guy (not always, but in most cases).

      As for automatics, I’m a big believer is reducing – and I mean everything. Reducing the amount of wires, plumbing, linkage, cutting up the floor, etc. A TorqueFlite with a Gear Vendor gets the job done but requires manual shifting and flipping switches. (Not ideal.) A traditional 3-speed TorqueFlite just is a big ol’ pain in the butt, especially because your modern Hemi won’t graft to your classic kickdown linkage and such. A Chrysler A518 (and 46RE) is basically a TorqueFlite with an overdrive, which only recently, is beginning to get the beefier aftermarket support to make it strong enough to take some big HP. Of course, Silver Sport Transmissions has their A41 4-speed overdrive that’s electronically shifted and designed for G3 Hemi swaps too.

      I almost always try to steer folks away from trying to cram in the modern 8-speed transmission. It’s massive size requires an exorbitant amount of cutting to the floor, cross members and necessary unibody substructure. Plus, there is just sooo much wiring and electronics to find new homes for. Just avoid it like the plague.

28. Do you have any Idea if a hemi would fit in my 52 dodge pickup?

    • No. That’s definitely going to be a bespoke installation.

29. I have sourced complete running 392 8-speed Auto… with factory powertrain control module (PCM), engine wiring harnesses, an accelerator pedal, O2 sensors…will I need a complete kit upgrade, or just replace what i do not have in the picture, or who is the resident expert I need to talk to, in order to complete what I need to do? Target body 67 Barracuda Convertible, slant six car. Thanks!

    • Be prepared to gut the Barracuda of every scrap of factory wiring, as well as removing the transmission tunnel, cross member, torsion bar mounts and front suspension. Trying to graft in the 8-speed and all of the factory harness is 90x’s more difficult than what is being suggested in this article.

      • we already past that stage Kevin…the article was addressing the conversion kit, which is what my question was directed at. Wanna take another look at it? Thanks! >>>> will I need a complete kit upgrade, or just replace what i do not have in the picture, or who is the resident expert I need to talk to, in order to complete what I need to do?

30. I’m thinking about dropping a Gen 3 Hemi into one of my Plain Jane steel wheel cop cars. I have an 87 Dodge Diplomat and a 87 Plymouth Gran Fury. Is it a big deal getting the Hemi into one of those engine compartments? Also can I use the Hemis modern automatic trans or do I have to stick with the 904? Thanks!

    • Frankly Fred, the short answer is “don’t.” But understanding you deserve a “why” let’s begin with: Currently, I don’t know of any company making motor mounts for Diplomats, so you’ll have to make your own. Getting the engine and transmission location correct is a massive chore and requires far more math than I think you’re willing to put in. And with custom motor mounts come custom transmission mounts too. Expect to change most if not all of your cooling system, fuel system and transmission cooling as well. Speaking of which, trying to use any of the modern automatics will require the wholesale removal of your transmission tunnel and cross members, as both the NAG1 and 8-speed TorqueFlite are double the width of a 904. Next, be prepared to extract ALL wiring from your engine compartment. Currently, there are no standalone wiring harnesses that manage the engine, ignition, fuel injection AND the modern transmissions. Holley has plug-and-play standalone harnesses for engines (without the cylinder deactivation system, pre-2006) but not for both the engine and transmission – which means, you’re stuck using the factory harness and getting that to play nice with your 35-year-old harness won’t be easy. Be prepared to radically upgrade your electrical system too, because operating both control systems requires a lot of juice (14.5amps consistently). Suddenly, keeping the 904 doesn’t sound so bad, does it? So as far as analog automatic transmissions go, you can either keep the 904, bolt on a Gear Vendor overdrive, or swap out to a A41 4-speed automatic from Silver Sport Transmissions. Otherwise, just upgrade to FiTech or Holley Sniper EFI and enjoy your car all year long.

31. Hi Kevin,

    Currently building a 69 Dodge Charger and planning to use Mopar’s 6.4L crate engine and their engine management system as well. My question is one regarding an issue I’ve seen listed in the forums……Several have mentioned that the PCM does not like the ignition switch on these old cars because they apparently don’t hold continuity in the run position while turning the switch to the crank position…..I would ask you if this is still the case with these new engine management systems, and if it is, what is your best suggestion at getting past it. I’m interested in being able to start the car without a push to start button and still make it run off the old ignition switch. Is a time delay relay the only solution?

    • Yes, you’re exactly right. The factory PCM doesn’t like the old ignition switch at all. The factory harness has a few other quirks not worth exploring here, but I strongly recommend you look into Holley’s standalone harness and PCM as an alternative.

32. Will the 5.7 crate work in a 66 Chrysler 300, with a 727 transmission…

    • Yes, but be prepared to do quite a bit of wiring, as the factory harness will simply struggle to feed it fuel and keep it running.

33. I have an 09 Challenger that rather than trade it in I am considering doing a 5.7 swap into my 1957 Chrysler can I use the harness in the car or do I need to go this route?

    • No. You’re going to be rewiring the car just to support the new harness for the engine. The factory electrical system is severely ill-equipped to handle all of the voltage necessary to run the new systems.

    • Mike, have you moved forward on the swap into the 57′ Chrysler? Just started a 2014 Ram 5.7 into a 57′ Chrysler. Looking for thoughts, ideas??? Thanks Ron Carlson/Rons Restoration 7016835710

34. I HAVE A 1967 DODGE CORONET , I AM WANTING TO PUT A 5.7 HEMI WITH A 545RFE TRANSMISSION. WHAT MODIFICATIONS WILL I HAVE TO DO TO THE FLOOR PAN TO ALLOW THE TRANSMISSION TO FIT PROPERLY?

    • You MUST read the previous comments. We’ve answered this a few times now. We STRONGLY recommend NOT using the 545RFE.

35. I have a 78 lil’ red express pickup with the 360. Can I mount a modern 5.7 and if possible the modern 8 speed transmission?

36. What is the Part # for a Center sump oil PanKit. Need it for a 2017 5.7L Hemi that is going into a 1967 Plymouth Belverde, I’m keeping the 727 Transmission so I need a Throttle cable that will work the trans also. Need help on part #’s or were I can find some parts that will work with this resto mod. Thanks

    Rear Sump Oil Pan Kit (PN 77072450): Oil pan, pick up tube, gasket,

    • That’s a lot of specific knowledge that we’re not going to be able to provide for you. Believe it or not, Holley has dramatically increased it Gen 3 Hemi swap catalog and will be able to provide you with suitable parts to complete your swap. I strongly suggest calling their tech line and speaking with a representative.

37. Hi Kevin, how come that you think a A904 does fit behind the modern Hemi but not the A727?
    The A727 are build with 3 different Bolt flanges, one for Big block (does not fit) one for 6 Zylinder (does also not fit) but one for small block, which fits behind the Hemi.

38. Can the ecm’s be tuned in this kit? I was thinking of a 392 supercharged in my 72 Cuda but would need the ability to tune the ecm. I already have a 2017 392 and a new Edelbrock supercharger kit, although it’s made for the newer Challenger, I think I can get it to work.

    • ECU’s can always be reflashed. I strongly recommend looking into HP Tuners’ new packages.

39. From what i am reading it will be a chore to install the 6.4 into a 69 383 Super bee with a 727 trans

40. Thinking of putting a 6.4l hemi and 8 speed auto trans in my 74 Challenger what can I or the shop that does it look forward to?

41. Thinking of putting a 6.4l hemi and 8 speed auto trans in my 74 Challenger what can I or the shop that does it look forward to? The motor and trans are out of a 18 Challenger SRT. Turn key pallet.

42. I’m restoring a 78 cordoba and would like to know what options I have available.

    • For a late model swap? Woof. Best reach out directly to Holley for that one.

43. Here is one for you, 91 D-350 I want to put a combination man trans,and engine upgrade? I want a fun power house to haul cross country with good mpg and plenty of getty up.
    At this point its a 5.9 automatic.

44. what do i need to put 2006 hemi and a518 transmission into 1971 dodge challenger and do they make a drive by wire

    • Throw that transmission in the trash until you want to cut out your torsion bar cross brace. You’re better off mating a Silver Sport Transmission A41 4-speed automatic and using the Holley ECU/TCU harness and computer.

45. Looks like you’re the man to ask this. I just bought a ’60 Plymouth Fury with the 361 cu. in. (Golden Commando) engine. The body of the car is in beautiful shape, but the engine needs work (burns oil, misses, makes a bad noise first time you turn the ignition key to start it). It has only 29,000 miles on it, but this will be my only car (except for borrowing my wife’s Toyota). I’m not some rich collector, just an old guy trying to relive his youth (had this model Senior year in high school and Freshman year in college). I have a good, not super-expensive mechanic. He has figured out what needs fixing now, but I wondering about getting a Hemi, or some other new/rebuilt engine that will be both powerful and super-reliable. What would you do? Thanks.

    • Frankly, you’ll find that rebuilding the poly motor will offer far fewer headaches. A Hemi swap is NOT an easy solution, and much of your otherwise original car will require wholesale gutting and heavy modification (particularly to the electrical system).

      • Hi Kevin,
        Very informative column! I’m finding answers to most all of my questions.
        I have one comment re Harry Binswanger’s post: his 361 is a Chrysler B block, so a 400 or 440 should bolt right in. The 361 if rebuilt, will accept most if not all “B” block upgrades (some limitations on RB block like the 413s, 426 wedge, and 440s which are all RBs.
        The poly was a 318 in 1960.

46. Oh, and it’s an automatic (R N D 1 2 buttons on the left dash).

47. Kevin, did my question about the 1960 Plymouth Fury not get posted? Or is it just awaiting moderation?

    • All comments must be approved first.

48. Kevin,

    I’m currently in the process of prepping that 69 Charger for the new 6.4L Hemi I received. I Just ordered the SST 5 speed TKX trans kit as well. My question is one that is not even slightly covered anywhere. In the name of all things holy, how does one install that worthless looking plastic DBW accelerator pedal with factory A/C!? None of my research even shows a photo of the installed angle. The forums mention using a cable operated bell crank TPS off of a 2004 RAM truck with the stock Charger accelerator pedal instead, but a call to Holley (after taking your previous advice and choosing their engine management system), told me they would not recommend it, as the 6 pin plug is different…..I can definitely fabricate a mount, but I’m not sure how to proceed without a visual of the installed angle of this pedal. Any help would be appreciated. Does anyone make a product that eliminates the need to install this specific pedal?

49. Looks like you’re the man to ask this. I just bought a ’60 Plymouth Fury with the 361 cu. in. (Golden Commando) engine. I’m wondering about swapping in a Hemi, or some other new/rebuilt engine that will be both powerful and super-reliable (it’s my only car). What would you do? Thanks.

    • Harry, I am by no means the expert on this topic, but I can relay a bit from others’ experiences. Seeing your other comments (calm down, all comments need to be approved prior to publishing because y’know, the internet…) I would STRONGLY recommend rebuilding the 361 Poly. The siren’s song of late model Hemi swaps leaves out the heartbreak of electrical evisceration required to keep the engine charged, the inevitable scorching of your factory dash cluster (unless completely rewired) and a cascade of other woes. Your ’60 Fury is an odd duck to be sure, and you WILL NOT find a plug-and-play all-inclusive kit for your car. Rather, build the engine, and for the sake of ease of use, strap down a FiTech throttle body EFI system. They’re affordable and darn-near bulletproof.

50. Thanks so much, Kevin. This is exactly what I wanted to know. I think you’ve saved me many agonies.

51. You recommend going fuel injection with the FiTech (I was going to get a new Holley 4 barrel). Exciting idea. Is that for reliability, added power, or both?

52. I see Jeep exhaust manifolds are recommended… Is it reasonably possible to get them to work in an E-body? I’d rather not drop $900 on headers for a driver. I keep hearing they will put the pipe directly into the firewall.

53. Hi Kevin
    I have a grand cherokee 2016 SRT 6.4 8 spd
    I want to use this in a jeep J20 84 model
    Have seen mopar kit looks like best option
    Cant find info on using 8 speed ( other than don’t )
    I have a NV 4500 out of a V 10 dodge ram can i make any of these work would prefer auto
    I have the complete car SRT
    I’m in Australia not much help available here
    I would appreciate any advice
    regards
    Darren Hallett

    • You’re venturing into uncharted waters. Holley has standalone engine harnesses and ECUs that will operate the SRT 6.4L on its own. Of course, nearly every scrap of wiring in the Jeep will also need to be replaced as the electrical system will need to be rebuilt to support the massive electrical draw that engine will require (and none of that includes the transmission and TCM).

54. Hi Kevin
    If i use the holley harness and the 5 speed manual this should get a round rewiring the whole truck as harness is stand alone is that right
    I see your news letter had some thing about Diablo but it appears it is only tuning for the existing ZF 8 speed ( it wouldnt except my email as i didnt have programmer in formation )
    Thanks for your help
    regards
    Darren Hallett

55. 1964 dodge Polara 500…Want to swap 383 out for the 5.7 liter kit. What all would I need to purchase to make this happen?

56. I have a 69 Hardtop Barracuda and word like to replace the 318 and 727. Looking to install a 5.7 and 6 speed automatic. Any recommendations for the swap.

57. I notice that this kit is good for 2014 Hemi engines and newer. I have a 2013 that I plan to swap into a 56 pickup. Is there a reason this kit won’t work with the 2013, or better yet, is there a solution to whatever the issue was at the time of printing? Thank you.

58. this setup will work with a 2016 5.7 hemi out of a ram truck ? even with the phaser timing ? and does it delete the cylinder shutdown feture ?

    • Yes. MDS will be removed. Call Holley’s tech line who is the industry leader in providing G3 Hemi swaps for classic cars.

59. I’m installing the 6.2 in my 1970 GTX. I purchased the new plug and play ECU from Chrysler and would like information on how to use my factory steering column and ignition system. Can you tell me how to integrate into the new electronics to start and run the new engine. Thanks

    • Nope. Because your factory harness cannot handle the constant load that your 6.2 Hellcrate requires. Be ready to strip all of your OE harness from your GTX.

60. So using the Hemi crate engine kit how do you connect the ignition system to the starter? I’ve not received the kit yet and I’m trying to figure out what else is needed. Also if you know does anyone build a new ignition harness to tie into the hellcat engine kit? Thanks again

61. So using the Hemi crate engine kit how do you connect the ignition system to the starter? Does the kit include wiring provisions that connect idmgnition to starter? I’ve not received the kit yet and I’m trying to figure out what else is needed. Also if you know does anyone build a new ignition harness to tie into the hellcat so I can use my original column? Thanks

    • Holley has standalone harnesses available for G3 Hemi swaps that integrate the engine control harness with the factory ignition and dash harness (with some understandable modifications). You’ll want to call Holley on Monday AM.

62. I just bought a 70 charger and just starting the resto. I have the numbers matching engine but want to put something new (engine/trans) in it. Do you have any suggestions that wont break the bank. Also what about rebuild the 383 that I have and upgrade (like efi, etc…)?

    • 440Source has complete engine packages for your 383, or a budget 440 build. You won’t make big power, but definitely more than stock/factory.

63. I have a 69 dodge powerwagon. What would be the best Hemi to drop into it?

64. i have a 2006 ram hemi swap going into an 88 ramcharger. I have all the factory stuff. I just want to know if I can use the mopar P5153530AB stand alone harness with a factory ecu. Or am i able to just use the factory harness and wire up my own stand alone without any issues.

65. Hello,
    Will this work with 6.4 into 1979 Dodge W150 Power Wagon?

    • As long as motor mounts and exhaust headers (or manifolds) are available.

66. Can you suggest which transmission I should use?

67. It’s a gen III 6.4l high performance hemi. 650 hp.

68. WANT TO PUT 2019 HELLCAT REDEYE AND AUTOMATIC TRANS SC-8HP90-X IN MY 72 DEMON WILL THIS KIT WORK SO I CAN USE THAT TRANS. THANKS REGGIE

    • Yes, and take your caps lock off.

69. Hey buddy i have a 1970 Barracuda convertible and im try to put a 2013 5.7 Hemi engine what would be every thing i would have to change?

    • Way too big of a question for the comment section.

70. Hi, I keep reading your post were you worn people about the need to rewire their entire car when they install a gen3 6.1, 6.2 and 6.4 Hemi’s in their classic Mopar’s.

    You mention the electrical load the swap puts on the wiring system. You talk about the system needs 14v to operate, there by the old wiring systems in pre ’70’s can’t handle the load. But no specifics.

    I’m abit confused. I know of no 14v batteries for automotive use. When a motor is running the alternator or generator will put out up to 20v depending on the unit if unregulated. Most systems regulate limit is set at 15v (approx) and run between 13.5 to 14.2v again depending on the load.

    So, my question is; what do you mean b y the classic cars wiring system can’t handle a 14v draw? Are you meaning voltage, OR amperage draw? If you are talking about amperage draw I can see there could be a problem with the older wiring system. However, the Police cars of the 70’s and up had high output alternators and no HD wiring to run the rest of the cars systems including the wipers, heaters, headlights, etc. Could you please explain to us readers exactly what you mean.

    Thanks, have a great Thanksgiving weekend.
    Ed

71. I have a 1957 Dodge Coronet four door 325 V8 two speed power flight transmission not a desirable car but it does look good I’d like to update this car can you tell me what’s the best engine and transmission and drivetrain to put in this thing just so I can cruise around with it

72. hi i am new here lots of info in & out . If you can ,2005 5.7 hemi 1989 904 out of a 318 pu how do mi get the trans to work best ? engine is DBW thank you

73. hi kevin can i swap out a1967 satellite 318 motor and put in a 6.2 or 6.4 motor with a new transmission how much work is involved thanks

    • Certainly! Be prepared to rewire the vast majority of your car; replace your fueling system; cut your floor and a large portion of your torsion bar cross member (possibly requiring a complete conversion to front coil-over suspension); and a few other things…

74. I have a 2012 ram 1500 5.7 with bad lifter and cam. I want to install a brand new 2016 srt 6.4 crate engine from mopar into this truck. What conversion kits are needed. Thanks for the info. Would like to start on this asap. Ready to order the engine tomorrow.

75. Just purchased a convertible ’68 Barracuda with a Slant6 as a project car. I anticipate the engine is under-powered and would appreciate people’s thoughts on engine alternatives that don’t make the car difficult to control or dangerous (e.g. no 440 block for me). Likely will put an automatic transmission with it so my wife will drive it on long trips.

    I intend to lower the stance, hot-rod it a bit, use non-traditional mopar paint color, and will put some meat on the rear end (e.g. am not intending to take a “restoration” approach). Might be open to a full injected engine and modern transmission too. Appreciate any input people have on the drive train related to balancing power with the reality that burn-outs, fish-tails and street racing are a thing of the past.

76. Need to replace the 318 in my 69 Barracuda, will the 345 work

    • Just as long as you’re ready to replace a large portion of your factory wiring.

77. I have a 1931 Plymouth 3 window coupe with a 6.1 Liter hemi. How can I be sure its really a 6.1 and not a 5.7, It says “Hemi 6.1L” on the coil covers, but I think they might be interchangeable. The seller said it came out of a RAM SRT-8, but I never saw the donor truck.

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