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the b16 head will not fit on a b seires motor from a prelude or accord.they are supposed to have decent iron sleeves... so forced induction? lol
otherwise, i don't think you can add a b16a head and add vtec to a b20a.
wordnot much you can do besides basic bolt ons for a few hp, or forced induction if you want more.
no 2 totally different motorsJust curious but would the older b-series intake mani's fit on the b20a5? If so I was gonna say find a gsr intake mani, throw a cold air on there, if you can find it a full exhaust. I wonder if the later gsr cams would fit either? Maybe swap in a b21 block?