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Old 01-27-2013, 06:56 PM   #2
69GWC
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Join Date: Jun 2012
Posts: 1,089
Re: Thermostat housing on sbc 400

I have found that it seems only the chrome housing that have a rubber O-ring seem to seal well, the ones without and just use a standard gasket allways seem to leak and I have had that the surface had warped and made them leak.

That said I would coat both sides of the gasket with a then layer of sealant and a tap would clean the threads out the best.
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