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The COMP Cams Big Mutha’ Thumpr 243/257 hydraulic roller cam is a high‑output profile for Ford 351W applications that need substantial supporting mods. It calls for roughly 9.5:1 compression and a 2800+ stall converter, and is best paired with an upgraded intake, gears and headers. Expect very rough idle as the tradeoff for increased power and aggressive throttle response.
COMP Cams Camshaft FW 299T HR-107 BMT T
