Does anyone know what is the best head to use on a 2002 block for 9.5 to 10 comp ratio. I was told that the best option is a 318i head, then the E12 head. I have a good rebuilt 121 head ( cast date 88 ) and i am tying to put in new high compression pistons. Is it worthwhile to switch to another head? or should I keep the 121 and enlarge the valves?
Thank you