Pick the wrong one and you'll hate your engine. If you have Desktop Dyno, you can plug in all of your engine specifics, including all the details of your cam, and see if the cam will do what you want. I'd say that Crane probably has at least 6 grinds that could be generalized as "RV" cams, and probably twice as many that could be called "3/4 race" cams. and tell them what you will be doing with the vehicle, and they will help you pick the right profile for your application. If you want what you need, call a cam manufacturer and give them the specifics of your engine (ci, compression, head flow, valve size, rocker ratio, intake/exhaust manifold type, carb info), vehicle, etc. If you want a smart parts guy to take advantage of you, ask him for a "RV" or "3/4 race" cam. Really no such thing, but if it has tall lobes, and makes lots of horsepower at high rpm, but can still be driven on the street (with the idle cranked up to 1200rpm or something), then they call it a "3/4 race". The cam I have in the '68 has been generalized as a "RV" cam, but when I bought it, it bought it for it's rpm range and torque aspects. then people will generalize it as a "RV" cam. If the cam is designed to pull, have low end torque, etc. It's a generalization of a type of cam profile.
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