These racing cams are designed for engines with high compression, a ported cylinder head with big valves, and a well-designed intake and exhaust system. They offer more top end power than the 'C' cam and can pull up to around 10k+ rpm depending on the engine. These cams are perfect for lightweight chassis used in circuit racing with close ratio gearbox. They also suit All Motor drag racing cars.

• Kelford Cams recommends KVS109-3S valve spring.