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Discussion Starter #1
When I downshift and comp brake my engine backfires out the pipes and a 10 inch flame comes out. I have and edelbrock 750 with out of the box setting with the screws two turns out. Thanx
 

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Flames?...cool reminds me of my old racing days..you are running to rich..unburned fuel is igniting in the mufflers..lean it out a bit and also check the timing..
 
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Discussion Starter #5
Its on my 390 with a solid cam with .571 lift and 236 degrees of duration so It is a bigger cam. Thanx
 
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