Product Description
Rover SD1 V8 Valves, Guides and Springs
All parts listed are suitable for Saloon, Sport & 4x4 applications unless otherwise stated.
Various different valves have been used since the Rover V8’s introduction; most having the standard “Rover SD1” head diameter: inlet - 40mm, exhaust - 34mm. However, early engines (pre 1976) were fitted with smaller diameter valves - 38mm Inlet, 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 (later heads only), without the need for extensive machining, are our Big Valves (Inlet - 41.4 mm, Exhaust - 35.5 mm, with waisted stems). These valves are particularly suited to large capacity engines.
Note: Some machining is required to the valve guide and seat.
Finally, the latest factory valves, as fitted to 3.9 & 4.2 engines since 1993, as well as the Series 2 Range Rover (4.0 & 4.6 engines), feature the same head diameter as SD1-type valves.
Note: All parts supplied are suitable for unleaded applications.
Standard Valve Guides
For use with standard cam.
Performance Valve Guides
Shortened & bulleted, for use with performance cam. Suitable for all valves.
Uprated Valve Springs
Single: Suitable for all engines with mild road camshaft. Uses standard retaining caps (ERC573).
Double: Suitable for all engines with fast road or road/rally camshaft. Special retaining caps required (ERC573S).
Note: Machining may be required to spring platform when fitting double valve springs to engines previously fitted with singles.