Joe and his son are dedicated to tolerances and the pursuit of perfection and this is obvious with every engine he builds! He does not crank out an engine a week like most engine builders. My heads were machined at the valvetrain bases and surfaces on the heads to eliminate any binding of the valvetrain operation! Rocker arms are heat treated for extra strength and most items are powdercoated for durability as well. Copper gaskets and head studs are required for the huge volume of air pressure on a supercharged engine.