The factory engineers weren't stupid. It's no coincidence all the factory muscle car cams were "around" 220* duration @ .050". Now before all you yahoos pile on with Max Wedge and Race Hemi stuff, I said Muscle cars, not factory race cars. Big difference. One you drive everyday or a "lot". the other not so much. Those engineers figured out early on "about" what the limit was for everyday spirited driving in a car that had more power than "stock". Sticking close to that recipe will yield good results. Listen up to 72bluNblu and rumblefish. Both make the same point while saying differently. One says the cam he has now, while it pulls like gangbusters on one end, is a touch soft down low. The other says more duration moves the power band up in RPM. THey are both correct. You simply have to decide if your off idle torque monster is what you want, or if you "can stand" losing a little of that for power a little higher in the RPM band. I know what I would do. Spend the money and trouble somewhere else! People routinely spun stock 340s up to and past 7K. If those "tiny" camshafts will do that and keep pulling, yours is about the same size. Do you really think you need more RPM, or do you want more rumble? Be careful how you make your decision is all I'm saying. You don't want to end up losing character on the bottom end just to achieve more character while at idle.
