Naturally aspirated racing cams to suit engines with high compression (12:1+), ported cylinder head with big valves and well designed intake (45mm+ ITBs) and exhaust system. More top end power than the 'B' cam, pulling to around 10k+ rpm depending on engine. Great for very lightweight chassis for circuit racing with close ratio gearbox. Also suits All Motor drag racing cars running on race gas. Kelford Cams recommend KVS109-3S valve spring.