Rover V8 Valve Guides & Springs
All parts listed are suitable for saloon, sports & 4x4 applications unless otherwise stated.
Various different valves have been used since the Rover V8’s introduction, most having the standard "Rover SD1" head diameters: 40mm inlet and 34mm exhaust. However, early engines (pre 1976) were fitted with smaller diameter valves - 38mm inlet and 33mm exhaust - which are less efficient. In order to benefit from the larger valve sizes, it would be more practical to fit a pair of later cylinder heads than to attempt to fit the larger valves to early heads.
Vitesse specification valves are of standard SD1 head-diameter, with waisted stems just behind the valve head.
The largest valves that can be fitted to the existing valve seats on later heads only, without extensive machining, are our Big Valves (41.4mm inlet and 35.5mm exhaust, with waisted stems). These valves are particularly suited to large capacity engines, but note that some machining is still required to the guides and seats to fit them.
Finally, the latest factory valves, as fitted to 3.9 and 4.2 engines since 1993, as well as the Series 2 Range Rover (4.0 and 4.6 engines), feature the same head diameter as SD1-type valves.
Note: all parts supplied are suitable for unleaded applications.