Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Pontiac 406 popping above 4000 RPMs
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Old 04-16-2002, 04:51 PM
NeedBoost NeedBoost is offline
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This problem can be caused by bad valve float. IF he didn't rebuild the whole engine himself, perhaps the original springs were reinstalled. Tired springs would cause a popping usually above 5000 or 5500 but very weak springs could conceivably pop over 4000. I doubt the valve springs were reused but it's worth a shot to check.

A.J.
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