Originally Posted by
OxxAndBert
I’m a big fan of the non-setting Permatex #3 for coolant related sealing, but no experience with the #1.
It looks like #1 is a similar product - but sets hard.
The #3 definitely isn’t affected by coolant. I normally use silicon for oil areas so can’t comment on that aspect.
I’ve done a few heads and gaskets over the years but never seen a gasket in basically good condition with a clean crack like that.
What was the reason for the head replacement previously? Any chance the block is cracked there?
Steve