About this product
Big Mutha Thumpr 243/257 Hydraulic Flat Cam & Lifters for Chevrolet Big Block 396-454
Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle.Description supplied by AMS RACING through its current Shopify listing. Product, performance, and health claims are the seller’s and have not been independently verified by StorkScout.






