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Its debateable whether a 16valve head will fit on the HF block, due to the fact that it doesnt have the extra 2 valve reliefs.
It would be nice if someone with an HF block would bolt on a 16 valve head and turn it over to check and see if the valves hit.. the HF has dometop pistons and if you could get a 16 valve head on it, it would have some mega compression.
btw, you dont necessarly *have* to change the timing belt, but it is recommended.
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