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I have a 91 CRX Si. I was wondering what would need to be done for a head swap to be dohc rather than sohc. What else would need to be done to be vtech
its not possible to only swap the head. if you want vtec without buying a full swap, which will run you about 2500 total after all the small parts and installation, then get a d16y8 head off a 96-00 civic EX.