competition single springs which give increased seat and nose pressure to race camshafts. Please note: in addition you need valve top cap 321879
Austin Healey BN4 to BJ8 (1956-68)
Manufactured from superquality silicone wire, their resistance against fading and breaking is extremely high. They can be fitted directly to the head with no fear of spring crush and enable the use of higher lift cams. Recommendable for fast road and race engines. Must be fitted when using competition valves.