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You could just throw in some $115 Crower Springs into you head and more than safe to 8000RPMs.
You can make well over 500whp on an un-ported 1G head, it is just easier with a ported head and you will probably see a more aggressive power band past 7000RPMs with a ported head. I wouldn't be surprised to see an unported 2G head hit 500whp with a sheetmetal intake on it. You don't need ports big enough to fist to make a lot of power, the EVO 8 and turbo Hondas have proven that. If your going to run oversized valves,you might want to get a port job and valve seats to match them. It's hard to tell what the gains might be with them, the gains that people get from fully ported $1200 heads are sometimes hard to measure. Not a lot of people are doing before and after tests. I would be happy to see a 20whp gain with a well ported head on a DSM, they aren't like a crappy cast V8 head where a monkey could see how some basic porting could make a big difference.
ACT 2100 street disc all the way!
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