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The COMP Cams Big Mutha' Thumpr 243/257 cam kit is a GK-style package for Chevrolet Big Block 396-454 engines, built for street/strip power. It requires about 9.5:1 compression and a 2,800+ rpm converter stall, and benefits from intake, gearing and header upgrades. Expect a very rough idle; plan supporting driveline changes to use this aggressive profile.
COMP Cams Camshaft Kit CB 299T HR-107 B
