Someone tell me what's the big deal with a Shim? I've turned motors 8 grand with them, as much stuff that moves around the base of the shaft is the least of my worries. The shaft doesnt know the base of the pedestal is steel and not cast aluminum. Small blocks have those puny 5/16 shaft bolts, at least I have the stout Hughes hold downs. It's not like I'm running a Comp eliminator motor here
Bad geometry and binding is what breaks valvetrain parts from my experience.
