A little guidance please.
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Joined: Dec 2012
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A little guidance please.
I just installed a rebuilt 300 i6 in my 1966 f100 and it is turning the exhaust red in about 60 seconds at idle. What in the world could be the cause???? It has a rebuilt Fomoco carb and new ignition. I don't get it.
Senior User
Joined: Feb 2005
Posts: 468
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From: Alabama
On a 300 6 cylinder there is a plate between the intake and exhaust.
There is a spring above and to the left of your exhaust pipe directly below your carburetor.
This plate closes to heat the carburetor and heat expands and opens the heat riser.
There is a spring above and to the left of your exhaust pipe directly below your carburetor.
This plate closes to heat the carburetor and heat expands and opens the heat riser.
Senior User
Joined: Feb 2005
Posts: 468
Likes: 9
From: Alabama
Heat riser from above heat diverted away from carburetor.
Heat riser from above Heat diverted too carburetor.
Heat riser cold engine position.
You should be able to move heat riser counterweight back and forth.
It may be stuck.
Heat riser from above Heat diverted too carburetor.
Heat riser cold engine position.
You should be able to move heat riser counterweight back and forth.
It may be stuck.
Moderator
Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
A heat riser that's stuck is just going to cause drivability issues.
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Junior User
Joined: Dec 2012
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It's the opposite, too LEAN and the exhaust will glow red hot. Also the timing, too far retarded can cause this especially at higher rpm without a load, such as when breaking in a new cam. New engine, did you hook up the vacuum advance?
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