Originally Posted by
Maximo
the 28 can match the peak numbers, but it cannot match the RPM range... The .21 can carry power much higher in the RPM range then the 28 can..... The 28 will make more power very early in the RPM range, usually too much ....but in the mid and top the .21 has more pull.... The .21 will also make the peak numbers higher in the RPM range and deliver the power much smoother.....Against a stock 28 the mod 21 lays down a spanking !
Right on! Thanks for the explanation.