Engine Backfire

[Johnny]

72 302 engine backfires at full thottle Runs good at 1500-2000 rpm. Has new plugs,wires ,rebuilt dist,coil,rebuilt carb 2barrel motorcraft. Timing at 10 deg btdc. Runs great around in town,starts great.Can anyone help.

 

[Seabronc]

Are the back fires from the carb or the tail pipe?

>-

 

[Johnny]

Are the back fires from the carb or the tail pipe?carb>-

 

[Yardape]

I had to read that about 10 times to find where you wrote carb. haha

 

[Johnny]

I had to read that about 10 times to find where you wrote carb. haha

I found the problem Heat raiers tube was rust and broke allowing a vaccum leak.