i have seen exhaust reversion do some funny stuff. i built a set of headers once with the little rings that hooker used to sell. one of them came apart inside the primary tube and found it's way into a cylinder.
could it be rust from inside the header tubes? ever dropped an uncoated header on the ground after it has been sitting for a while? lots of loose stuff in there.
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'78 Ford Fairmont 526ci pontiac; true 10.5 tires and stock suspension.
5.14 @140.5 w/nos; 8.86@151 all motor.8.17@172 1/4 mile w/nos
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