90-110 and Defender V8 Head Gaskets and Oil Seals
Composite head gaskets are thicker than standard tin gaskets and will therefore lower the engine's compression ratio. Ideal for correcting compression ratio when heads/block faces have been skimmed. Not applicable 1995 on.
Approximate gasket thicknesses are as follows:
Standard (tin) gasket - 0.5 mm
Composite gasket - 1.2mm
Typical effect on compression ration:
Standard (tin) gaskets - 3cc
Composite gaskets - 10cc