When I stripped my barrels I found I had had O rings machined into the barrels as well, both inner and outer, and a head gasket was also used. The deck hieghts seemed standard.

It is worring as to how little material there is left to get a seal from the water way to the bores.

After trying to get replacment o rings to fill the grooves as I planned to use head gaskets, I bought RS250 ones. The inner was a good fit but the outer was slightly to big and too thick.

I ended up just buying off the roll o ring material and cutting it to length and superglueing them together.

This was only last week so I havent finished the build yet, so I dont know how sucessful its been, and if they will hold. I take the view that I have two chances and time will tell.
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Russ

MC21SP