These COMP Cams Thumpr cams will make your 1958-1965 Chevy 348 or 409 wake up and sound nasty. Thumpr cams have a long exhaust duration and other grind characteristics to produce a powerful, hard-hitting exhaust note. Lifters sold separately.
High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers. Rough idle.
Thumpr Cam Spec Chart (GIF)