3/4 race topped out at 300° duration and .500 lift. Here's a general quote: "a 3/4 race cam is 1-1.5 sizes larger than an RV cam. and 1-1.5 sizes smaller than a race cam. the RV cams are generally 260*-270* and 455"-470" lift. The 3/4 cams are generally 280*-290* duration and 480"-500" lift. Anything larger is going on full race. Of course this is for hyd SBC cams. "