ZX12 Hi performance cams from Megacycle USA with recommended valve springs (16) & including extra slotted cam sprockets for cam degreeing.Cam # 419-1(In) / 419-2(Ex) Specs > Lift In -10mm Exh – 9.9mm Duration @ 1mm lift In – 255* Exh – 248*. These cams increase mid range & top-end power.This is a MUST for a ZX12 performance motor, use with modified pistons & above valve springs for Max HP