Backfire

Most loud backfires are from the exhaust and not the carb. A carb backfire is a low pop and if real luck, followed by a little flame in the carb bowl. A real loud pop or bang, like a gun shot, is coming from the exhaust. This is caused by a few different reasons, most common are unburnt fuel hitting the hot exhaust and exploding in the headers or an exhaust valve hanging open at the wrong time.

IMHO not something to worry about, hyped up motors will be a little sensitive until things warm up. But if it happens all of the time, you might need some tuning. I am sure others can offer more hints to reduce the frequency.

Hey V8,

If this happens more than once, take this to mean your motor is telling you something is wrong.

Backfires can occur in the tail pipe, at the outlet of the tail pipe, in the intake manifold and above the carburetor. The power valves of Holley carburetors will be damaged by backfires in the intake manifold. If your car starts running poorly, fuel mileage is worse, black soot in the tailpipes, the smell of unburned fuel in the exhaust, your power valves are most likely "toast".

Backfires are caused by a mis-firing condition, but there are many many causes of a misfiring condition. It could be as simple as water in your fuel tank. Or maybe its just a one time freak occurence.

Hey, your names are growl & rover, what is this, a kennel? lol.................

your friend on the DTBB, George

I can understand if the engine was hot, but this first thing in the morning. no prime, the very first turn of the key. The engine is a new 500+HP so bad valve would reallt concern me.

None of the other symptoms so far. Well PI has got the car now for the rest of the exhaust...their new stainless "loud" mufflers and other stuff. I told them about it and they should be able to help me. I am just not versed enough to look for the right symptoms I guess.

Ruff ruff...from the kennel