Parts Source Info - Car 2 Intake Gasket - Impala Tech
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post #1 of 3 (permalink) Old 07-18-2017, 10:44 PM Thread Starter
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Parts Source Info - Car 2 Intake Gasket

Title should say Carb to Intake...

Performed a search. No results were yielded, or my searching kung-fu is not up to snuff.

Anyone have a good source or recommended lead on a good "heat-shielded" type gasket for a stock carb to intake manifold on 66 impala? I looked on Google too but did not see anything like what I am looking for.

I just fixed a 66 quadrajet carb that had leaking well plugs so I rebuilt it but this car still suffers a bit from fuel buring up or heat soaking. Still starts a bit hard when hot. I haven't found any more leaks and I am distilling heat even using old school hairpins which helps but I think there is heat coming up from the intake manifold probably helping to evaporate fuel. So I'm trying to source a good gasket that will help with heat shielding.

Any info appreciated and thanks in advance.
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post #2 of 3 (permalink) Old 07-19-2017, 09:01 AM
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You can buy a phenolic plastic spacer that requires a gasket top and bottom to isolate the carb from manifold heat.

Mr Gasket 3406: Phenolic Carb Spacer Quadra-Jet Flange - 4-Hole | JEGS

And yes there is heat under the carb from the exhaust manifolds that goes from one side of the engine to the other. It is there to allow your car's engine to warm up faster while you are attaching your tire chains to go out for a drive in the snow. If you do not regularly do this you might consider disabling this function by replacing the heat riser valve (that thing that makes the rattling noise on the passenger side of the exhaust system) with a solid spacer that has no butter fly valve inside of it and doesn't leak.

Chevy Full Size Chevy Heat Riser Delete, 2-1/2", 1958-1974 - Eckler's Late Great Chevy

Additionally you can replace your intake manifold gaskets with steel block off plates that prevents the exhaust gasses from passing under the manifold. These plates will rust through so the gaskets have to be replaced annually or bi annually.

https://www.summitracing.com/int/par...ese1-_-fel-pro

Big Dave
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post #3 of 3 (permalink) Old 07-19-2017, 09:21 AM Thread Starter
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Fantastic, as always. Thank you Big Dave for the direct links. Very helpful and useful. I wasn't able to find any hits with the way I was searching online. I did contemplate on the riser - and this car does not see winter so I suppose there is no harm in disabling. Good stuff.
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