Exhaust H?
My exhaust system backfires. it consists of headers, pipes, and mufflers. i have been told that the back fire in the exhaust system (not the carb) would be caused by air in the pipes because of poor welds. i have also heard that an "H" pipe is the correct way of exhaust work, instead of two isolated straight pipes.
is either reason right? aftermarket carb, bypassing emissions controls, '84 305 K5 GM
3" collectors on the headers
A backfire occurs when unburned fuel ignites in the exhaust.
If you had bad welds what you would hear is the continuous sound of the cylinders firing. (i.e. louder exhaust)
Check your timing, and if it is OK, lean out the fuel mixture by slightly opening the air adjustments. This will mix more air with the fuel. Carbs running 'rich' tend to cause unburnt fuel.
All 'H' pipes do is balance the exhaust pressure to quiet the exhaust. If you have performance enhancements like headers, etc. there is no need for the H pipe.
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