This head has just been finished and has been calculated at approximately 10-to1 compression ratio. It is similar to those we fit to our SAFARI FOUR® engines, which see 95-100 M.P.H. on the flat at sea level in an 88” Station Wagon. All valves, valve seat inserts and valve stem seals are new & fresh. The exhaust valves are auscenitic steel and are thus compatible with unleaded fuels available today. It also has been fitted with induction-hardened seats under the exhaust valves, so seat degradation will not be an issue. The exhaust valves also are fitted with Genuine Land-Rover valve rotators, as fitted to North-American Specification machines, which are now almost impossible to locate. Probably NO OTHER HEAD you purchase today will have these!!