Very interesting discussion - now I'm even getting more concerned about the functionality of this engine in the 3100. So Jerry, what you're saying is that the choice of cams won't matter since the valve recess will remain an issue?

My build sheet only lists, "Surface .060" and ""Valve Grind with Head Assembly". Is surfacing done if there is something like warpage or for performance modification reasons? Typically, can either or both heads and blocks be "surfaced" and does it matter which was done?

Unfortunately the shop was closed 20 years ago when the owner passed. This work was done in 1996. If it helps, the build sheet lists valve parts: 01192 Exhaust Valves; SBA562-9 J-Lay Exhaust Seats. No mention of Intake Valves or seats.