Ult, again your right on the money. Steven and I talked today and re-did the math (he understands that there will be a variance between ideal within a few thousands / or mm), but what we discovered is that FR didn't grind the seats correctly and you just can't get there from here. Anyway, I think Steven and FR has come up with a solution, we'll keep you posted.only if ALL of your valves were .27 total lash (thats why i put example).
were they all .027, or are some different?
realize that when your done w/the math, you wont be able to get the exact fit, but you'll need to see what they make, and then order the closest (if your choice is between a looser 1 and a tighter 1, go loose (not too much of course)). and if they dont make 1 anythin close to some of yours (those 600s worry me), then you'll need your valve seats ground down.