I need to get the O-rings for the head. Where do you get them and what material are they made of? As for machining the head my brother is a machinist and he can do that. I seen a couple of thread on here that tell you how deep the groove has to go.

 

I had my head O-ringed at ATS in Denver, they used what appears to be copper wire, they told me it was .061" ATS is in the "links" section.
Good luck

 

Thanks for the info. Getting parts ready for the winter overhaul