The only to fix piston slap is bore the block and new pistons. That's why I said I'd leave it alone if you determine that's what it is. Most real HP engines from the factory had a little piston slap anyway, due to high compression and full floating wristpins.
Yessir. The noise don't bother me like that! I ain't a quite one! These have C clips, if I remember. Is there any way to " lock down" that? After warm er up and listen? Noise Don't bother me, the thought of killing my mill real does!