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Old 03-27-2013, 11:51 AM   #4
ghill901
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Join Date: Mar 2013
Location: Phoenix, AZ
Posts: 2
Re: 1970 C-10 knocking sound

the timing is what i thought was off also, I had the timing adjusted but still the same rapid knocking noise. Also when i decellerate my truck backfires. it sounds like it is coming from the carb itself. What controls the spedometer cause when i hit 60mph the needle goes crazy and drops.
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