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Discussion Starter · #1 ·
I just rebuilt a 302 for my stang, but when it idles it pops thru the carb occasionally, but when I accelerate it really pops. it is fine tho when it r's get to about 3 1/2. any one know what could cause this? I tried the timing arleady and a diff. carb.
 

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Did you switch to a 351 firing order, or do you have the distributer 180* out? I have done both, so it does happen
 

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Sounds to me like either a messed up firing order, or an intake valve not closing all the way. My bros inline 300 had horible carb popping when his exwifes bad luck resulted in a broken valve keeper and the #1 intake valve dropping and bending. When that cylinder fired, it went right up through the intake.
 
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