I have a 325es instead of swaping on the I head, and gaining nothing. What if i where to take the stock eta head and give it double valvue springs and make the head work at high rpms, thus giving me the high compresion of the eta with the rpms of an is. I know a very good chip maker that will make me a compete custom chip
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2.7lt stroker
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because the intake and exhaust ports are smaller, and so are the valves. you could do it and it would give you more power, but it doesn't really make that much sense given the flow restrictions of the e head and intake system.
of course it would be cheap, and at least torquey.. but it might peter out in the top end.
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