The code number shows the time the valve is open
255 PROFILE: Mild Road Cam: Excellent all round camshaft for use in all engine sizes. Excellent emissions. Fantastic torque.
270 PROFILE: Fast Road Cam: For use in all engine sizes. 8-12 bhp increase depending on cc. Smooth idle. No machining required.
285 PROFILE: Ultimate Road Cam: Excellent when used in 1275cc and larger engines. Fives massive improvement in mid-range and top-end power. Slightly lumpy idle.
These 3 types of camshafts often don't need any other modifications.

300 PROFILE: Rally Cometition Cam: Torque and power are what you need to win rallies. That is exactly what this cam provides. Designed for use ing 1275cc and larger engines, capable of producing in excess of 135bhp.
320 PROFILE: Full Race Competition Cam: The reputation of this camshaft is now legendary. This camshaft can give over 150bhp in a 1380c engine combined with staggering torque from 4000rpm! This cam has probably won more races than any other.