Thread: Deciding which Lifter a motor has

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The definition of an RV cam is fairly high lift, fairly short duration and wide lobe seperation angle (112-114) for smooth idle and high manifold vacuum.

If your motor idles rough, it's not an RV cam. Some people just use that terminology because they don't know any better. The rough idle results from fairly long duration and a narrower lobe separation angle to allow the motor to breathe at higher rpm's.

An RV cam will be effective from idle to maybe 4,500 rpm's. If you're getting a rough idle, your cam is probably effective from about 2,000-2,500 rpm's to about 5,500 or 6,000 rpm's. I can't be specific not seeing the cam card, I'm just giving you an overview.

The locks on the rocker nuts are the way the aftermarket suppliers address keeping the nuts tight. Chances are about 99.9% that you have hydraulic lifters in the motor.