hey, they have diff size domes 22cc,21cc,20cc etc.... they pretty much work with all coolheads. if u wana go a lil faster, raise ur compression by getting a 21cc dome. i believe thats the smallest u can go n still run pump gas but double check b4 u buy. if ud like u can call a site spomsor(FAST, HJR,) and they will lead u in the right direction. Also if u got the xtra money throw sum vforce3 or vf4 on there to get more bottom end and throttle response!