Your idle sounds faster which has an effect. Are you running an X or H pipe? That tends to cancel out exhaust pulses and make the idle sound smoother.
Mine definitely sounds like it has more “hair” than yours. My cam is Part# HIT 284281. 234/242 & 296/304 advertised duration, lift .473/.488. The cam centerline is ground 6 degrees advanced.
I’m unfamiliar with your part number but the duration(s) at .050 are close to mine. Yours may be the earlier version which had more lift.
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Triple Black 1971 GTO
Last edited by NeighborsComplaint; 04-01-2026 at 05:42 PM.
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