More HP from 5.9 Magnum

easyrider said
magnummopar, I trust that you know what you are talking about. You pulled me out of a bind when no one else could diagnose the problem. This engine runs good but I would like a little more. I know gears would help but hate to give up the mileage. This is a cruzer and not a race car. I would be happy in the 300-325 HP range. I'm not sure, but I don't think a stock 340 was any more than that.
Tom

Thanks Tom, I would swap the cam, 800 cfm TB, our ignition upgrade and valve springs and see what you think of that. In a 5.9 that should net you 350HP and probably improve MPG as well. Your stock 5.9 cam is a whopping .410" lift and maybe 190 duration so the 212 and .510" would be a big improvement. The 5.2 PCM should work fairly well with that cam as is but would see good gains with a flash. You could trim the intake runners on your kegger to move the curve up 500 RPM. If you want a but more fun, get the 215 .530" cam which will need a flash but will put a grin on your face. Spring kit is $195, billet cam is $379, regrind is $179 and TB is about $275 depending on which one you get. You can upgrade the rockers with one of our rocker packages, which will add HP gains due to stamped being inconsistent in ratio. 1.4-1.65 is typical ratio for factory stamped where roller tip or full roller remain true. Nothing you are talking about is expensive, and can all be retained if you ever decide to go bigger. Evan