How smooth does the top of the block deck need to be for MLS ?

Mopar Sam said

Don't tell my wife's 3g hemi. I surfaced the heads and block on my van norman 570. I don't want it to start leaking!

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I ran one of those among all kinda other stuff in the machine shop I worked in as a kid. The owner had converter it from the turntable that held the blades to a rock and that thing cut to a mirror finish depending on which rock you used. Dang good machine.