Performance world rockers

He'll send you an instruction sheet and pics of how to measure four or five points and send the info to him. Only tricky one is top of shaft to the tip of the valve. What he's doing isn't rocket science, and he'll admit that. It is a fairly straight forward math problem using widely available formula and equations. But he is doing the calculations for you, accurately, and providing offset shims and I think he tells you how much you need to open the holes in the shafts if needed. I was going to borrow my daughter's geometry book and see what I could come up with but got a headache just thinking about running through those equations again. I'll let Mike do that and buy his kit.

Agreed. Honestly, even if you did the math, and then drew up the parts yourself, you'd probably spend what Mike charges, or more, to have a job shop whip you out a set of the shims. It's not cheap, but it is a bargain.