Hi, I am setting up an engine, project creep has led to full top and bottom
rebuild. A few questions:

I showed the machinist the docs on prechamber and valve depths, he measured that I need the 3'rd oversize prechamber sealing rings. None of the usual vendors have this. Has anyone experienced this? Could this head have had such a busy life? The valve seats and valve depths look normal. I think I'll have to go back and double check this.

The oil pan has the cylconic oil separator fitting. I don't know what the "integrated supporting shell" looks like. Is there a standard way to plug this fitting? Is there another way to id this motor as .950 vs .952? If it is a .950, what do I need to do to bring it up to .952 performance?

I will need instructions on setting up the timing from crank to IP to camshaft from scratch, because everything's coming out before going into the washer.

thanks,
Stuart