Cosworth Camshafts are ground on NEW chill cast cores to the highest standards. Each Cam profile is carefully designed to maximize performance accross the entire power band, producing strong power gains throughout. These cams are compatible with the Cosworth CNC ported Big Valve Cylinder Head. Two grinds to choose from: The M1 grind has a duration of 270 degrees @ .002" an 195 degrees @ .050. The M2 grind has a duration of 280 degrees @ .002" and 200 degrees @ .050.