| | Mopar Performance Hemi Engine Blocks have undergone revised,
updated tooling. They are machined to closer tolerances than ever and feature increased material in the thrust area. Features the original 4.25" bore size while maintaining water flow between the cylinders (non-Siamese) for improved cooling and sealing durability. As an added feature, if you want to drop in a
Hemi where a Big Block used to be, select the block that has ears cast and drilled on the sides to accommodate Big Block engine mounts (P5007669AB).
Rough bored at 4.19". | 
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