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Competition Cams 11-601-20
Thumpr NIT 235/249 Hydraulic Flat Cam for Chevrolet Big Block 396-454; High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle. Nitrided.
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Competition Cams 12-601-20
Mutha' Thumpr NIT 235/249 Hydraulic Flat Cam for Chevrolet Small Block; High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle. Nitrided.
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