I am rebuilding a 1974 CL450 DOHC engine. I measured the lift on the exhaust cams. Spec in the service manual is 0.1846 - 0.1853. I am getting 0.1800. The Serviceable limit is listed as Replace if under 0.1830. It doesn't appear worn, but the numbers are the numbers. Anyone know where I can purchase an exhaust cam. Also should I replace the followers? I really don't want to spend a ton of money.