Agree to disagree. Where I don't hate off-the-shelf cams because I'm an avid collector of the mopar Purple Shaft cams I still believe that in the long run a custom tailored cam will out-perform the prior. I run both but I'd say the cam custom made by Racer Brown for my 3,800 pound 4 speed pickup will outperform the Mopar 620 purple shaft of the same power band all day long because the Racer Brown one is built to breath for 7,500 rpm and build low end torque at the same time