Looking advice on best head to use. I have a 1600 bottom end with 1600 16v flat top pistons. Currenly running a 1600 Round Port head with a bit of porting. Its standard apart from that. I get valve lift at high revs and want to move to solid lifters and comp valve springs. But want to make sure I decide on the best head for the job. I have 1300 D Shape heads and SE Round ports. The 1300 has a smaller combustion chamber which should raise compression, but it might be overkill... Would a SE Round port be a better option?