For Top Stock, the camshaft can be replaced as long as it retains stock lift specs. There's no restriction on duration, however. To that end, a custom-grind from Comp Cams was ordered. With lift specs at .530 on the intake side and .542 on the exhaust, the cam's duration measures 248 on the intake valves and 254 on the exhaust. This spread results in a 110-degree lobe separation.