a camshaft lobe all early technology camshafts were ground on a symmetrical design ... not exactly the same the reason some camshafts are this way is to try to achieve an ... camshaft a camshaft b engine kits a dualpattern camshaft has an intake lobe ... 260º camshaft a is referred to as a dualpattern while camshaft b is referred ... to as a single pattern with the advent of emissions laws and ... computer systems more modern single and dual profile pattern designs have been ... developed a dualpattern camshaft is ground to bias the ...