View Full Version : 383 backfires on passenger header at big end
nutup
10-21-2010, 07:02 PM
after a quick rev with rpm dropping I have a back fire in passenger header I has never done this before timing is good. Could a valve be out of adjustment I have poly locks and a stud girdle
bixblk
10-21-2010, 08:01 PM
the popping maybe a cracked valve spring , or unseated valve. carefull I would lookin to it before racing again. pull the valve covers and check things out JMO
cepx111
10-21-2010, 09:04 PM
Check your header bolts/gaskets, a exhaust leak will cause one to backfire.
kwkracing
10-21-2010, 09:05 PM
it could be many things a broke or weak valve spring is what i would check for first if it was running fine before. Also do a leak down on the cylinders to make sure the rings and valves are sealing. That will tell you real quick were the cause is
blowninjected540
10-22-2010, 01:00 AM
Valve Spings X3
curtisreed
10-22-2010, 03:22 AM
I agree with Charlie. Check for header leak. Gets a large shot of fuel when the throttle is closed and when it sucks air past the flange it will ignite in the header. Mine will do it if I don't keep an eye on the bolts.
Curtis
nutup
10-22-2010, 02:49 PM
you Guys nailed it loose header bolt thanks to everyone that replied
Scooterz
10-22-2010, 03:50 PM
Man, isn't that awesome when it is something that simple??? If it were ME, I would have a spun bearing, wiped cam w/ several busted polly locks & a cracked head... plus a dog peeing on the front wheel too.
nutup
10-22-2010, 06:02 PM
It was a simple fix I had a lot of bad thoughts too thats what is great about the forums there is so much knowledge out there and people willing to give advice
Scooterz
10-22-2010, 06:22 PM
It was a simple fix I had a lot of bad thoughts too thats what is great about the forums there is so much knowledge out there and people willing to give advice
Amen. Great folks here. I have learned a bunch from many of them over the years... stick around... something else will happen. LOL Welcome.
bixblk
10-26-2010, 05:58 PM
Hey Nutme
Sorry for misleading you, I have had a tough 2010 as others have had. And I have not had an easy one this year. Glad it was a cheap easy fix for you
Good luck .Stay safe
cepx111
10-26-2010, 10:46 PM
you Guys nailed it loose header bolt thanks to everyone that replied No problem, glad we could help, been there done that.
Cp