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post #1 of (permalink) Old 09-30-1999, 09:17 AM Thread Starter
fratt77CJ7
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Exhaust Backfire?

Still having probs w/muffler. Whenever I patch or replace mine I get some backfiring. Bad enough to blow out the patch or bust the muffler. I've given a complete tune-up, reconditioned a head with a bad seat. New intake, exhaust, and head gaskets. Can't figure it out. Does not happen as long as there is a whole in the muffler (no back pressure I guess). It runs fine otherwise, starts right up, no ping/knock. Any ideas? Thanks all.
fratt
"77 304V8, TH400 auto, Qtrac

fratt
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