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As long as you get a B-series head, it should swap without problems. B16A3, B16A2, or B18C1 are your best options for VTEC heads since they flow very well and are reasonably easy to find. But it's not necessary. You can run without VTEC and do other things such as turbo, nitrous, build the engine internals, etc.
The wiring and sensors may be a little different for the B20 motor from the one you're taking out. You also need things like the axles and ECU from the motor. If you do a VTEC head, then you'll need a different ECU if your engine is not VTEC and the B20 ECU is not capable of managing VTEC either.
My roommate's B18B eats me alive and it's not VTEC. He's got a lot more torque than me though with some bolt-on's.
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1995 Honda CRX del Sol VTEC
Manufactured: Suzuka, Japan
Production Sequence #1269
Team Del Sol member #1131
HondaVision: Team Sol Forum - Home of Team Del Sol
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