I can see where a template would be beneficial in a few select areas like the short turn. Otherwise some specs/dimensions would suffice. Got to be a lot more careful with water in the old iron heads.
Haaaayup. My heads don’t match match because I was just making the ST a skosh wider and there it was. That little blister you see when you know you are screwed.
So I had to grab another casting and start over.
If it’s not a W2 head I don’t even consider porting on them.