Grinding, " diesel " noise under valve covers

Ironracer said
Arrgghh.. I'm still hoping for piston slap, at this point... if I need a gasket set, sounds like I'll need a Complete rebuild. Rip it all apart. Clean, inspect/ measure it all... Rings, rods, main, and cam bearings.... or am I just gonna fix the issue at hand? Whatever the heck that is! Didn't see any Shine, but the light on the oil, they all rotated freely between my thumb and finger. No pressure. One was tight, I gave that to the engine cycle
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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.