Quote Originally Posted by Matt167
you could buy a set of dart 49cc heads, I'm not shure of your current compression but 305 heads are 58cc, so the dart 49cc heads would bump your compression ( more power ) and be better flowing ( more power ), there not that expensive ither. you may have to run premium due to higher comp tho
The 49 cc heads you a refering to have a port volume of 180 cc.This is way to much cylinder head for a stock 305 engine and even if he builds a 334 they might still be on the big side.