I have a 2003 SJ 701 and just checked the compression and both cylinders were at 140. I am looking for the best head I can buy that will still let me run pump gas. As far as motor mods I have a limited B pipe, Zero lighted fly wheel, vforce 3 reeds, and msd enhancer. I would like to know if a girdled head is necessary? Also the best brands and what doam size? Possibly could get higher octane race fuel if the gains were noticeable for the extra hassle. Thanks!