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I'm sure you have one of the wires crossed or your distributor is in 180 degresse backwards

  • sound like you have it timed on the exhaust and not the compression - or 180 degrees off. Get it to TDC, rotor on the #1 plug wire, and go from there.
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Q: If you have the correct firing order on a 302 why is it still backfiring through the carburetor?
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