Real work has had me tied up but ill have tons of time around Christmas for the sbox.
I had already matched the spacer to the manifold so I started working on the cylinder side. The studs were off center..
I ended up filing the through-holes on the spacer to get it centered and marked it.
Most of what needed to be removed was where the passage tapered down just at the port entrance. Still not finished but I'm close.
I got the case boring tool in the mail.
Went to bore the hole and realized I lost one of the crank dowels when cleaning. Sigh..
[edit] Xlint - Were both of your valve failures with NCY springs or was the first failure with stock springs?