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Discussion Starter · #1 ·
I replaced my holley 600 with a rebuilt autolite 1.08 450 cfm on my 65 289. Car runs/idles way better than before, except not all the time, but a few times now at high rpms it'll backfire through the exhaust (when floored). Should I upjet the carb? Could the butterflies not be opening all the way?

Thanks in advance, Chris
 

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Does it backfire when you floor it, or start breaking up at high rpm?
 

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Could be lean, but answer 427stang's Q 1st.
 

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Discussion Starter · #4 ·
I think when I actually floor it and it kicks into the next lower gear, then it starts to break up. Thanks
 
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