The JE Pro Seal head gasket for the BMW M30B35 engine is specified at a 3.630" bore and 0.039" thickness, serving as a direct-fit head gasket for that application. Offered as a precision head gasket solution, the Pro Seal unit is intended for top-end sealing where the M30B35 engine requires a correctly sized, application-specific head gasket.
JE Pro Seal BMW M30B35 3.630in 0.039in Head Gasket