So clearances were complete by the engine shop as per the CP piston and rod spec sheet the rings were gapped as per the cp spec for turbo engine, i don't have these specs anymore as engine builder returned the engine and not the piston and rod documentation. OEM plugs for the n20 are already 2 step cold iridium plugs, so no need for anything else, as for semi closed deck dowel pins were inserted into the block using the headgasket as a guide/blueprint.