Quote Originally Posted by chevy 37
I have been running stock heads that I ported but I just put on a set of Sportsman ll which should increase my HP and torque by 40-50. Next is a gear chage to 3:55 and should be able to get into the low 13's with it.
I.M.O.,those heads are about 3 sizes to big for your 305.
Did someone recommend those large heads??