After years of teasing, reproduction cast iron Hemi and wedge blocks are looking more and more like a reality for 2021. As we chronicled back in March, several big-name players have been in the game and most have had something in the works for quite some time now. Mancini Racing recently announced a partnership with Callies Performance Products/Energy Manufacturing Ltd. as their iron lung production begins to liven up.

For the Hemi, four variations will make up the initial offering, all carrying authentic Mopar part numbers. The 4.245” rough bore blocks are available with finished (MOPP5160210AA) or unmachined lifter bores (MOPP5160211AA). Finished blocks can be had with a stock 4.250” (MOPP5160209AA) or a 4.500” (MOPP5160208AA) bore. All feature factory camshaft location.

According to Mancini, the two 440-based wedge blocks will feature bore sizes of 4.315” or 4.500”. Details are a little sparse, so it’s still unclear if they’ll be four-bolt main versions like Mopar Performance offered at one time. Regardless, everything is based on original Mopar molds, cores, and engineering data, which should result in a high-quality piece worthy of some hefty horsepower. It does look like main caps upgrades and ARP fasteners will be optional.

For more information, please call Mancini’s Sales Manager, Wes Sheehy, at (800) 843-2821. Blocks are still in the pre-production stages, but they’ll be happy to answer any questions or put your name on the order list.