What head gasket for boost? MLS leaking oil

question... are you doing.. iron head to iron block, or aluminum head? the RA finish has to be pretty smooth for the MLS gasket to seal up right. cometic has detailed instructions for the finish requirements on both surfaces. I've seen heads and blocks ( all brands ) get surfaced or decked and leak out the corners. make sure the shop that does it sharpens the stones if it is a quik way surfacing bed, if thats what they use (old school, but works great ).