Anything more than E7's with a stock cam and you're taking a chance. I'm running E7s right now, have been for about 3 months or so, and its a lot better. Just make sure that you use better valve springs so you don't float the valves. Any heads with bigger valves won't work unless you clay the piston and check it out. Personally I'd go with the e7's for now unless you want to flycut the pistons.
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