Well, I think I would start with calling Crane Cams, and speaking with one of the techs...give them the numbers and see what they say. Remember, it very could be Comp Cams too. And for what its worth, never buy a used cam....there is no way you can get a history on it, and no matter what people tell you about re-using a cam, it rarely works, even with the same lifters in the same place. I have had bad experiences trying to use a used cam with same lifters, with new lifters, etc...it usually doesnt work. The problem is when it goes bad, there goes the rest of your rebuild too, with all sorts of metal particles in there. A new cam and lifters can be purchased for a little over a hundred bucks, and in my opinion, messing with something used just isnt worth it.