As the cylinder block and head are not rigid body, when the Head Bolts are tightened, the gap between the surfaces and the surface pressure applied is not even across the whole surface. Moreover, due to combustion pressure and vibration while driving, the conditions are continually changing and the contact surface is being continually beaten.

As a result, a good gasket must ensure that contact surface pressure is spread as evenly as possible and also adapt quickly to the ever changing gaps that can appear in the contact surface to maintain a good seal with good pressure.

Heavy Duty Gasket For Evo Models IV - IX. We recommend this gasket for high horsepower applications where is is not possible to surface the cylinder head and block face due to its enhances sealing capability. Please select from the options on the right.

Stock images used. Actual product may vary.