A Complete gasket kit for top end rebuilds on the Diablo 88 EngineIncludes:

• Inner Head O-ring
• Outer Head O-ring
• Base Gasket set (three thicknesses) The original gasket is 0.5mm thick, with the other two thinner gaskets included to use to adjust squish tolerance as needed. The ideal range for squish clearance is 0.7mm to 0.9mm. The original 0.5mm gasket should get you in that range. If you are under 0.7mm add the thinner gasket to bring into spec.