My thermostat housing story...
EVERY thermostat housing on any engine I have had has leaked.
Untill now!
- I bought an OEM style repo housing
- I block sanded the intake, still had to end of old corrosion poc marks
- IMPORTANT... I cleaned out the bolt holes in the manifold till the bolts could be screwed in by hand and bottom out on the bolt head / manifold surface.
- I bought a gasket from Real gaskets Thermostat Housing Gasket - Chrysler, Dodge, Plymouth - Older V8 Engines
- I installed the gasket EXACTLY AS THE INSTRUCTIONS SAID AND TORQUED THE BOLTS TO THE CORRECT INCH POUND SPEC
7+ years not 1 drop and I use a 16lb cap