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Old 02-14-2011, 12:51 PM
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Red Hot Headers

I just finished my rebuild with a lot of your help, I ran the car for a few minutes and my header tube turned red hot,
This is a SBC 350 with a Rochester 4 BBl, board .030 over, from what I have been reading my mixture screws are out of sync. Can someone please tell me how to adjust the screws I have read soo many post and each one is different.

My timing is on the money from what I can tell.
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Old 02-14-2011, 01:15 PM
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carb adj

turn them both all the way in.. carefully... and turn them back out 2 full turns. thats ususally a very good starting point and your be within 1/2 turn in/out...bill
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Old 02-14-2011, 01:16 PM
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Define on the money, timing could be an issue, retarded timing will cause a higher temperature at the pipes.
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Old 02-14-2011, 01:53 PM
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I have adjusted the timing to 10deg BTDC, I thought the timing was the issue at first but after looking at it a few times it seems to be ok
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Old 02-14-2011, 02:00 PM
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Thank you Bill, I will try this tonight and let you know if it helps,

It has to be the mixture i get a fuel smell when the motor is running from the exhaust.
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Old 02-14-2011, 02:28 PM
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Hi,

Does the engine have a healthy cam? If so, you may need more base timing than 10 degrees. It sounds rather "low." As long as your total" *ALL in* static timing doesn't exceed 36 degrees (without vac. advance) then I think you could bump it a bit.

Red Hot exhaust and that "gas" smell is incomplete combustion. Check your timing one more time.

Remember that cams at idle almost act like a "smog engine" in that they sometimes contaminate the charge in the cylinder. Provided all else is OK, a little more timing may not be bad. (Add a degree or two, but no more!)

-Matt
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Old 02-14-2011, 02:35 PM
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off to the shed with timing gun and Carb tool, Thank you guys I will let you know how things go.

thanks for your help so far.
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Old 02-14-2011, 03:21 PM
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If the car sits at high idle, the headers will turn red because there is no airflow around them. Also can be due to overly rich mixture or too lean exhaust. Now, I don`t know what cam your using, but if it`s RV specs then it needs more timing. lightly loosen the distributor bolt, with vac advance disconnected and plugged, bring the timing up to 12 degrees before top dead center. Lock distributor down. Reconnect vac advance to a full time manifold vacuum source (one that pulls vacuum full time, including idle) recheck timing, it should be around 20 - 24 degrees btdc.
This is how GM did it from the factory, you have to remember, idle and off idle is lean, and the leaner the mixture, the slower the burn and this is why more advance is needed.
As for the carb, one way to check if it`s too rich or too lean is with it idling and the headers glowing, place a flat tip screwdriver on the pump shot arm.
This way it doesn`t move the throttle. Give it 6 shots If the glowing gets better, the carbs too lean and the additional fuel is riching it up to close to normal. If the glowing intensifies means it`s way too rich and the extra fuel is only making it burn hotter.
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Old 02-14-2011, 09:33 PM
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Make sure the PCV is in the back of the carb and not the intake manifold.
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