Bolt on big bore kits mean easy installation with no machining and no rebalancingS&S bolt-in cams and premium tappets make the most of the added displacementCams are .482'' lift and 240° duration intake and 234° duration exhaustCompression ratios: 9.6:1 for 1200cc kit and 11.2:1 for 1250cc kitEasy installation bolt-on parts, no machining, no rebalancingUse stock heads, pushrods, and fuel system