What are some causes of intake backfires in a 60s chevy truck?

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bashfulbyte

New member
I had the timing fixed but it was only advanced by 3 degrees. They said due to all the aftermarket parts they couldn't find the problem unless they could re-create it in the shop. It does it every once in a while on startup. I turn the key and *POP*, turn the key again and it starts normally. I think it has a holley carb that was modified to 750cfm, a unique holley high rise strip dominator and the engine is a 383 from a 84 chevy 350 4 bolt main. and MSD. What could make it do this?
 
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hotness

New member
Well it could be incorrect fuel mixture. Usually on a carburetors engine once the engine start (hot start) I step on the accelerator once to clear the carburetor throat. On Fuel injection engines you don't need to do this. Its a must that the ignition system is in good shape before making carburetor adjustments, This means good cap, rotor, plugs, wires, etc...
 
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