Thanks Tyler,
You nailed it , I haven't pulled the head yet but some dog has had all this apart and there is bodged up bolts everywhere
I got the head off, silicone everywhere all over the gasket. No obvious sign of gasket failure into the pushrod tunnel so still not sure where the crank pressure was coming from. Very minor dip in the head and the barrel at the tunnel faces but only visible with a torch on the other side of the steel ruler. I'm pretty sure a bit of extra tension on the head bolts on that side would close it up
Seeing you are aware of the problems with the head gaskets Tyler, have you heard of any tricks to try preventing the issue.

Last edited by NormK; 07/11/23 05:36 PM.