The Crower roller cam and lifters actuate the valves via Crower 3/8 chrome-moly pushrods. Dig the Conversion-specific head bolts in the floor of each intake port. You'd think they'd disturb port flow but are proven to have a negligible effect. Original 426 Hemi blocks have cast bosses on the walls of the lifter valley that engage studs protruding from the deck surfaces of the heads. Lacking on wedge blocks, the Stage V solution is ingenious.