Titan Motorsports - Titan 1/2" HEADGASKET - 93-98 Toyota 2JZ SUPRATMS 1 2" (0. 5" inch) Head Gasket for 93 98 Supra Be careful as competitors may use a different gasket and they machine their gasket with a drill or drill press. We CNC machine our gaskets, because so you are able to then control the cutter speed and make a precision enlargement for the head stud holes. This is done with a special bit to enlarge the opening of the gasket and create the stud holes within . 001 tolerance. This is done as the head gasket