that's if any only if the redline is 14k rpms and not 16k. according to eaton the redline for the gen V m62 is 16,000 continuous rpms. so even a 2.8 pulley isn't passed that at 7k rpms.ItalianJoe1 said:you are pretty much right, the belt drive is slightly less than 2:1, the crank drive pulley is 6", factory blower is 3.25" i think, so there is plenty of safety margin. With the 3" pulley in the stage kits and the 7000 rpm redline, you are still within the allowable range for the blower. People with the 2.8 or smaller pulley are exceeding the limit on the blower, but i havent heard of anyone having problems yet.