http://www.g2ic.com/forums/showthrea...light=JDM+B20B
So here are all the parts needed to be swapped over from the b18a...
-Engine wiring harness
-Distributor
-Fuel injectors
-Driver's side engine mount
-Header downpipe bracket
-Header
-Driveplate, flywheel and clutch combo
-Tranny (duh)
-Power steering pump and bracket
-Crank pulley
-*possibly the alternator - 'specially if it didn't come with one
http://www.g2ic.com/forums/showthrea...light=JDM+B20B
you need to use your b18a thermostat housing and the b20's thermostat cover. you'll see a plug on the b20's cover that is not on the b18's. you need to lengthen the wire (on the b18 the plug in on the back of the block. on the b20 it's in the thermo cover), you'll only be plugging in one wire to the bacl of the block, the 2prog plug you just let it hang.