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Originally Posted by Daschicken
Obviously newer emissions standards don't tend to allow sky high compression ratios
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Not only compression ratio, since nowadays there are much restrictions on the exhaust stream on newer engines.
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Unknown as of yet, but if it has chain driven camshafts, the heads could be milled to increase compression. The Honda I4s had gear driven camshafts which make head milling impossible.
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I wouldn't really hold my breath for this newer engine to have gear-driven camshafts, even though such feature would be quite interesting.