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Old 11-08-2012, 07:43 AM
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Exaust header temps

I have a SBC 350 from a 1974 Corvette. I had it bored .030 over put in a mild Edelbrock cam, Hyd lifters. It has an Edelbrock dual plane intake and an Edelbrock Carb. A 650 cfm if I remember correctly. This engine is in a street rod, 40 Ford, 4 door Pickup. Has been built for 15 years plus. the temps on the header tubes are cylendar # 1 - 300degrees F, #2- 300d, #3 -530d, #4 - 450d, #5 - 360d, #6- 470d, #7- 350d, #7- 350d and #8 - 390d. Is there a problem and what is it? I don't like there being some tubes a lot hotter than the others.

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Old 11-08-2012, 08:08 AM
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This is typical of a dual plane manifold at idle. Its not a big problem.
Make sure the motor has enough spark advance at idle.
lack of idle spark advance makes the headers run hotter than they need to.
The bigger the camshaft used, the more the motor will like plenty of timing at idle.

Carbs can be custom calibrated specificly for a specific dual plane manifold
to even out the idle fuel distribution better so all cylinders run close to the same.
EG: carb booster venturii tweeking (bottom shape of the booster, Idle circuit tweeking,
Intake manifold plenum floor fuel directors. (turtle) correct manifold plenum heat (exhaust)
and or heated air inlet helps a lot. Factory stock oem carbs and manifolds are fine tuned like this.
All the factory OEM smog air cleaner stuff ( Heat management) has a purpose.
A cold intake manifold will have more varience. Liquid fuel does not burn.

One thing you can do is look for and eliminate all manifold vacuum leaks that can make 1 or more cylinders run lean
and effect exhaust temps.
None of yours look excessive.
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Old 11-08-2012, 09:19 AM
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Thanks, I was not sure if this was a big problem or not. Will make sure there is pleanty of advance. maybe I can get the carb tuned and improve things.
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