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Yes, sure, you can build a pushrod motor that can go faster. You build out the other areas to their maximum, and take the hit on RPM. But all things being equal, if you went OHC of some sort you'd be able to spin that same motor faster and make more power.
Pushrods just have too much mass to allow the engine to spin fast. Unless you can make them really, really short, you're looking at 7000-8000 rpm, max. The TNT300 redlines at 13,000 rpm.
Charles.
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