Product Description
Rover V8 Cylinder Block Components
All parts listed are suitable for saloon, sports and 4x4 applications unless otherwise stated.
Composite head gaskets are thicker than tin gaskets. When fitted to 3.5, 3.9 and 4.2 Engines with 3 rows of cylinder head bolts (and 34-36cc combustion chamber heads), composite head gaskets will lower the Engine's compression ratio. This means they are ideal for correcting compression ratio when head/block faces have been skimmed on these Engines.
Later 3.9, 4.2, 4.0 and 4.6 Engines with 2 rows of cylinder head bolts have smaller combustion chambers (28cc) and composite head gaskets as standard. Using tin head gaskets on these Engines will result in a higher than standard compression ratio - ok if that’s what is intended, but undesirable otherwise.
Approximate gasket thicknesses are as follows:
Standard (tin) gaskets = 0.5mm. Composite gaskets = 1.2mm.
Typical effect on compression ratio: Standard (tin) gaskets = 3cc. Composite gaskets = 10cc.