hottttt
Laughing Gas
Joined: Jan 2009
Posts: 914
Likes: 71
From: Lavergne, Tn.
Back in the 60's while taking an auto-diesel class, we had an engine running on a dyno. The instructor turned out the lights, telling us to watch the cast iron exhaust manifolds. We saw them start glow bright orange and then nothing and then orange again. We watched this repeated several times...... the instructor was retarding the timing and returning to normal timing. Retarded timing will definitely heat up your exhaust headers.
Logistics Pro
Joined: Nov 2011
Posts: 4,685
Likes: 81
From: Northville, MI
That might be normal. Modern engines run much hotter combustion temperatures than our old flatheads. If you are driving at highway speeds for some time with any kind of a load that would be normal. But at idle then timing and mixture as previously suggested would be the most obvious causes. If both are correct then a vacuum leak: cracked hose, ruptured brake booster diaphragm, missing PCV valve, intake manifold gasket, carb base gasket, etc.
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