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Old 08-31-2007, 11:30 AM
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carb heat shield

For those of you who use a carb heat shield, have you found one that actually helps? I have limited hood clearance, so 1/2" thick would be max. I was running a tarantula intake, with no hot start symptoms, changed to performer rpm. The carb bowls, Holley, had tons of clearance under them using the tarantula, now the fuel bowls are real close to the manifold, which has to be the problem. So the need for a heat shield. I'm not sure if a phenolic 1/2 spacer would work better than an aluminum heat shield. Ant thoughts?

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Old 08-31-2007, 12:10 PM
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What I used in the past was the carb gasket for a 1983 Mustang GT that came with a holley carb from the factory. The gasket is about 1/2 thick and not only acts as a gasket but also acts as a heat isolator. Any parts store should carry it, if I recall correctly, it was a fel pro item. I would use studs with this gasket with equal tightness, this will make the gasket compress without the worry of stripped threads. It could also be the timing is too far advanced, or the mechanical advance is stuck in a open position, or last but not least, the electrical system has gotten tired. I always run a ground from the battery to the block and the block to the frame, this usually solves a hot start problem.
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Old 08-31-2007, 12:58 PM
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Edelbrock carburetors are well known to be heat sensitive also ... and I had the same problem ... so I used a aluminum heat shield. Chevrolet has them in their high performance catalog.

Edelbrock makes a gasket also for this purpose ... With one below the aluminum shield and one between the carburetor ... I had no more problems ...



These Edelbrock heat insulator gaskets are designed to help prevent fuel percolation in Performer series carburetors exposed to extreme underhood temperatures. They're available in both open and ported styles, and come complete with extended-length carburetor studs.
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Old 08-31-2007, 11:29 PM
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Mr gasket has a kit that has a number of base gaskets and thin aluminum spacers that you stack alternatively, its pretty cheap and you can get it up to 1" I think. The nice thing about it is the height is up to you.
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Old 09-01-2007, 01:34 AM
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HOLLEY PN 108-70

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Old 05-31-2008, 12:43 AM
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This thread is still cool i think.

A lecky once suggested the same material they use as fuse boards in fuse boxes. Its a bit heavy but..... Its DIY and in my opinion very effective. You could make multiple layer ones for spacer types with an air gap between each layer using carb gaskets or thin spacers. Whatever you like...

Im going for a more finnished larger two layer design that also shields the carb fuel log next.

If im wrong, let me know. Pics are of a new carb/RPM/engine with the current plate which ive been using on a 350/victor junior for about two years with no probs with oil fuel etc. For a dual plane like the RPM Air Gap id have a divider down the middle of the open area whith the manifolds divider plate notch extending into it.

#### if you do this dont breath any of the material when drilling, filing, machining etc. Wear a breathing mask and clean up properly ####
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