headers turning red
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
headers turning red
ok here is a quick question. is it normal for headers to glow red? at about 3500 rpm. i noticed while timing my truck and checking full advance that after a while the pipes right of the heads were starting to glow red. some more than others.
Senior User
Joined: Jan 2002
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From: Centreville USA
But don't forget that in general, even if timing and mixture are correct, thin steel headers will dissapate more heat then heavy cast iron manifolds. That is why so many headers are coated with JetHot or something similar. Ever see the dyno engines in magazines where the headers are glowing red?
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Joined: Oct 2005
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From: brooks a.b.
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Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
timing is set at 12 BTDC . i decided while reving it i would close the choke a little. sure enough the engine picked up speed and the headers didn't glow anymore. but the bad part is i am using a autolite carb and no one sells new main jets . or do they? anyone know where? i need size 58 from the shop manual it says. i have 54 in there now. thanks for your help.
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Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
For .067" that would be #55 drill bit, it is .067" exactly. I have used clock reamers, made notes on how far up the taper to repeat as well spare jets then road tested with fuel / air ratio gauge.
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Post Fiend
Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
I have a numbered set, a letter set and a metric set of bits. It is amazing how close you get to what you need with that many choices, including the standarc fraction of and inch set of bits.
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Joined: Dec 2003
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From: "Islander"
Bear 45/70, your correct on metric drills to get that "between size" holes that fractional, number or letter drills don't cover. A person can never have too many spare jets specially if your drilling and reaming as you will over do it more than once.
Gashog, if your headers are turning red you will damage even ceramic coated heads coating without external airflow.
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Gashog, if your headers are turning red you will damage even ceramic coated heads coating without external airflow.
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Last edited by "Beemer Nut"; Dec 1, 2005 at 08:05 PM.
Posting Guru
Joined: Jul 2003
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From: Eureka, Ca.
Originally Posted by ford390gashog
don't worry about fancy ceramic headers here. i went with cheap dynomax 16 ga heads with 3/16'' flange. the piant is gone already.