Have an older motor looking to upgrade the cam in has a cl-2 in it and It runs good but I am lacking top end. Faster karts start pulling away about 3/4 down strait away. Have tried what was supposed to be a cl3 in this motor and it was a turd, couldn’t get over 65-6600 out of it. It will crank up to 67-6800 all night with the cl2. Have another motor with a bsp4 and that motor pulls like a freight train. How does the ev6, trj a-4 or Dr. Fast cam compare to say the bsp4 in terms of pulling and top end? Will be run on a super heavy kart on 1/8 mile track 691ft around the groove. Gearing around 13/61 to 14/65 depending on conditions. Dropping around 11-1200 rpm.