Exhaust popping

[awd-turbo]

So I am new to carb engines... I have a 351w stroked to 427 from Mike forte. I have gas'n headers, and factory five side pipes. I have been running the car mostly w just open headers during the build. I have not put many miles on the car. Less then 3. I am working on finishing the car up and tonight was the first night I could take the car out w the pipes on... The car is making a loud popping noise if I let off the gas, but only on the passenger side pipes. Almost a backfire type noise.

Do I need to run the car more and burn some carbon into the pipes? Or is there an issue I am missing? Any help is welcomed...

Thanks
Brian

[Paparazzi]

I get the same from my 351W, mostly from the passenger side .... unless I try hard to let off at just the right speed and revs then I can get driver's side too. :-)

I had a TVR 400SE in the UK before I came to the US. 4litre V8 with a single pipe the size of a coke can (literally). If I let off at the right revs and speed I could get a fabulous set of bangs and pops and even the occasional flame.

I'm getting my carb rebuilt soon - I hope it still pops on the overrun afterwards. You don't like it?

[Jeff Kleiner]

Popping on decell is typically due to an exhaust leak.

Jeff

[alv69]

Popping on decell is typically due to an exhaust leak.

Jeff

I agree it is the cold air getting drawn into the exhaust.

[Bad Moose]

What Jeff Kleiner said.

Check gaskets or header seal

[awd-turbo]

Excellent feed back... I'll check all the gaskets today... Thanks guys

[awd-turbo]

I have tighten everything up so snug... And it is still popping... Should.i pull everything and use new gaskets and sealant???

[Bad Moose]

Can you isolate the popping to which side the engine the popping is coming from. I would start looking at the exhaust port for traces of exhaust on the head. Maybe fire up the cobra cold and see if you feel the exhaust pushing out. I would make darn sure I found the leak before doing header gaskets for the fun of it....... If it is the gaskets look into Remflex gaskets.

[awd-turbo]

to late bad moose.... hahaha i pulled the headers last night and ordered some gaskets.... also got some new gasket sealant... I do know that it is just on the passenger side. When i looked at the inside of the headers only two of the four looked like they were black on the inside.. the front two didnt look dirty at all...

[Avalanche325]

This might sound strange, but don't use gaskets on the headers. Use copper high temp gasket maker and they will never blow.

I was skeptical when I read this, but decided to give it a try. I blew both of my header gaskets in the first 1000 miles. I am at 14,000+ without gaskets and no leaks.

[Gilmore]

X2 on the copper high temp gasket.

[Bobby Doug]

X2 on the copper high temp gasket.

X3, you cannot go wrong with it.

[chopthebass]

I get it too. I was told it is unburnt fuel igniting in exhausts?