Are Volvo cams clearly marked C, D, or whatever? Is there an easy way to find out what it is without completely pulling it out of the engine? Mine is still in the car, which is a 1963 PV544 with a B18D. Just wondering since IPD has D cams on sale right now, and I am tempted. I think mine is probably still stock, but not sure. I would not get to this job until Springtime at the earliest.