Cam HP capability

Well, if you look, you may note the one I spec'd ends up close to the XS282S, but with more lift to get the heads where they want to be. I dont think a single pattern will be the ticket for your setup. As a step down, I'd go with the XS274s It has a bit less duration at .050, but still has enough lift to get you to .480 at the valve. Remember that milage has to do with efficiency at your cruie rpm. Any of these cams will be similarly efficient within a range of about 400rpm. But the larger ones will make more peak power and torque. A similar engine (albeit 30" bigger) gets great milage (17+ highway) with a cam that's 238°int/248°exh @.050 hydraulic. It also makes about 480hp by the ETs. But, the heads flow a bit better (260ish/190ish). Better ehads need less cam. Im sure with the perfect head and perfect conditions the cam would make good power. Curious on the result of the calculator... when did the hp peak? What was the torque like? And yes, all products supplied by a certain manufacturer will be for thier own gain. I'll run it thru my program tonight just for giggles.