Unstoppable Coolant Leak

The pictures in post 12 show indention at both the top and bottom of gaskets. I pressure tested it before this last gasket change and it held at ~18 psi with a cold engine. And again, it's fine at temp, with easy revving. Purposely drove it easy everywhere last Saturday and it was okay (up to ~200* haven't been able to get things hotter than that). It seems to be when it revs hard that it leaks. Whether it's rpm on the water pump causes a spike in pressure or the short spike in heat from cylinders, I don't know.

Tomorrow I'll do a more thorough test with the tester to see if I can figure out more.


I used sealer on gasket to block, gasket to intake has a silicon ring around it you can see in post 12. I used to not rtv this gasket at all and never had a problem with it. And yes, there are no dowels in the china walls.

Doesn't matter. RTV both sides of the gasket every time. That silicone that comes on the gasket is usually so dried out from extended shelf life it'll never seal.