What would cause #8 header pipe to turn cherry red? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Ironangel** · 06-22-2012, 08:12 PM

Howdy guys, my sons new race motor, 350ci with heads and cam(races 1/2 mile dirt)is turning the #8 header tube cherry red while the other 7 remain normal. We checked for blockage in the tube and its open. The plug is black with carbon so Im thinking its not because its too lean in that cylinder. Its a new engine with a new cam he was just breaking in when that cylinder pipe got noticeably bright red! Can an exhaust valve be hanging open or the seat burnt? Thanks in advance and I'll follow up with results, Thanks again! ~Michael Hill~

cableguy0 · 06-22-2012, 09:00 PM

Two things can make the header tube cherry red. First is a lean condition. Second is a rich condition. The fuel will ignite in the header tube and create a ton of heat. I would replace the plugs ohm the ignition wire to make sure its ok and check the cap and rotor for buildup. Any suspect parts should be replaced. With only one cylinder being affected I would thoroughly inspect every piece that feeds only that cylinder.

Marv D · 06-22-2012, 09:19 PM

Or retarded timing

**Ironangel** · 06-23-2012, 01:49 AM

Thanks for the replys you guys! I know he's got the timing advanced quite a bit and he did just replace the distributor cap as well as go up a size on the the jets in the Holly two BBL racing carb...I'll up date tomorrow, Thanks again!~Michael~

fastwillie 696969 · 06-23-2012, 09:34 AM

Quote:

Originally Posted by Marv D

Or retarded timing

boy do i know about that

06-22-2012, 08:12 PM	#1
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	What would cause #8 header pipe to turn cherry red? Howdy guys, my sons new race motor, 350ci with heads and cam(races 1/2 mile dirt)is turning the #8 header tube cherry red while the other 7 remain normal. We checked for blockage in the tube and its open. The plug is black with carbon so Im thinking its not because its too lean in that cylinder. Its a new engine with a new cam he was just breaking in when that cylinder pipe got noticeably bright red! Can an exhaust valve be hanging open or the seat burnt? Thanks in advance and I'll follow up with results, Thanks again! ~Michael Hill~ __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

06-22-2012, 09:00 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: What would cause #8 header pipe to turn cherry red? Two things can make the header tube cherry red. First is a lean condition. Second is a rich condition. The fuel will ignite in the header tube and create a ton of heat. I would replace the plugs ohm the ignition wire to make sure its ok and check the cap and rotor for buildup. Any suspect parts should be replaced. With only one cylinder being affected I would thoroughly inspect every piece that feeds only that cylinder. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

06-22-2012, 09:19 PM	#3
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: What would cause #8 header pipe to turn cherry red? Or retarded timing __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

06-23-2012, 01:49 AM	#4
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: What would cause #8 header pipe to turn cherry red? Thanks for the replys you guys! I know he's got the timing advanced quite a bit and he did just replace the distributor cap as well as go up a size on the the jets in the Holly two BBL racing carb...I'll up date tomorrow, Thanks again!~Michael~ __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"



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