popping in header like plugs fouling - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tbirdman88 · 01-01-2004, 10:29 PM

i have a 400 small block in my 85 chevy with a edlbrock carb and hei ignition. the problem is, when the secondaries are opened up it starts popping through the left header after 3500 rpm.

thanks
tbirdman88-donnie

chevyfan420 · 01-01-2004, 10:48 PM

how old is the engine? could maybe have a couple bad exhaust valve seats. the fact that its out just one side is weird

tbirdman88 · 01-01-2004, 10:56 PM

the engine is a 72 4 bolt main. not sure on how old the rebuild is.
I thought it might be a cracked valve seat, or a flat lobe on the cam. still guessing?

tbirdman88

**swervin ervin** · 01-01-2004, 11:03 PM

Might be a weak valve spring too. There's a number of things it could be.

01-01-2004, 10:29 PM	#1
tbirdman88 87 short crewcab Join Date: Jan 2004 Location: duncan okla Posts: 82	popping in header like plugs fouling i have a 400 small block in my 85 chevy with a edlbrock carb and hei ignition. the problem is, when the secondaries are opened up it starts popping through the left header after 3500 rpm. thanks tbirdman88-donnie

01-01-2004, 10:48 PM	#2
chevyfan420 Registered User Join Date: Nov 2003 Location: Ancaster, Ontario, Canada eh Posts: 95	how old is the engine? could maybe have a couple bad exhaust valve seats. the fact that its out just one side is weird __________________ 80 Chevy K10 350/350turbo 86 Chevy 1/2 ton shorty project truck 79 Chevy 1/2ton 350/350turbo not much to look at... *Retired* 97 Chevy C1500 4.3/5 speed.....daily driver

01-01-2004, 11:03 PM	#4
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Might be a weak valve spring too. There's a number of things it could be. __________________ Mike 1985 Chevy C-10

01-01-2004, 10:56 PM	#3
tbirdman88 87 short crewcab Join Date: Jan 2004 Location: duncan okla Posts: 82	the engine is a 72 4 bolt main. not sure on how old the rebuild is. I thought it might be a cracked valve seat, or a flat lobe on the cam. still guessing? tbirdman88



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.