Originally Posted by little_chicken
isnt the only differnce between the k20a3 and the k20a1 the camshafts? and maybe the vavle cover color. cause if i'm not mistaken they're the same engine, different heads
you need to do more research. there are way more differences between the two and you cant just take a a2 head and put it on to a a3 and try to make it the same engine there are a lot of differences like the a3 isnt build to handle a lot of power its for reliablity and great gas mileage. also the a2 has a built in oil cooler so youd have that bennefit goign with that. and i do belive that the k20a2 has already made bigger numbers than any h22 from what ive read and it boost easly. but it will be a harder swap from what ive read because it spins differently so itll take a little more fabrication but if you look on hasport.com or whatever they have everything needed for the swap and unless you have a welder or know a good exhaust guy you should get there header for the swap. thats abou tall i got hope this helps