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These pumps do not have an internal bypass
a compact supercharger drive system
The Callies Compstar center counterweighted crank with stock stroke brings a lot to the party
75:1 when paired with a 68cc combustion chamber
There are a number of options available with these blocks
Mechanical Roller Lifters - Small Block Chevy All Pro These pumps do not haveBorowski Race Engines' lifters feature a 4 column design for ultimate strength and rigidity while minimizing mass. Deep roller bearing pocket provides maximum roller bearing shrouding, maximizing rigidity and thrust surface area with smooth rounded edges that minimize lifter bore wear. Made in the USA. Triple Alloy Steel Billet Lifter Bodies machined on state of the art CNC equipment. Machined with one and done concept for ultimate relational accuracy