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The HF head has 8 valves. The DX and Si heads have 16 valves. The HF pistons will not have room for the 8 extra valves used on the DX and Si heads. I don't know what the compression ratio effects of having more valve pockets than needed would be.
I'd look for a used long-block if I were you. You can sometimes find them on Craigslist, and there are a number of importers that carry various engines. Also check on honda-tech and on the crxresource BBS.
-soD
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