umm to disable vtec would just take unplugging the clip. but why would you do that total waste of vtec head. id say if you boosting b20 you must sleeve the bitch lol b20 have girly cylinder walls. cant hold much boost. for the head go with stock b20 head . just buy some valve springs, valves retainers .. ect. but like most people are stating the bottom end is a must man.. concentrate on that or youll see your self looking for a new block.