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embarracuda

15 years ago

Sounds like timing of a exaust leak. If it is timing total timing might be out it would make it pop on top end.

mke64

15 years ago

i would have to say sticky valve or timing is off from my experience messing with gm motors

64belair4dr

15 years ago

Had a customer once that had a exhaust leak after the header that caused this reaction and yes check the timing a 2400 then 3000 see if she advances to fare on the 3k mark

76roadrunnerparts

15 years ago

have you checked your timing or possible rev limiter