I am planning on doing a K20a3 swap in my 01 Civic Si (EX states) and use the motor out of an SiR (Si states). I'd prefer the motor out of the hatch instead of the base RSX because of the electric power steering but either one will do.
My question is, does anyone know if it's possible to use the head off of a RSX Type-S or R, with that cars ECU on the K20a3?
Would like to have the flow of the head, high and low cam lobes on both the intake and exhaust cams and the true VTEC engagement point of that motor.
Also, would I be able to use a thinner head gasket to raise the compression ratio up a bit? And does anyone make a thinner head gasket for the K20?
I know I could just make it easier and use the motor out of the Type-S or R but the price of these is just way too much.
Anyone with info or links to help would be appreciated.

for the head gasket question muguen and toda make one that bumps the comp up and ur 1st question didnt really make sense

I am interested in the first question too. Is it possible to swap a K20A2 head into a K20A3? Would there be any advantages/disadvantages to doing this?

yes you can swap the heads..

advantage is that you would get true ivtec

yes its possible. difference between them is k20a2 head has variable valve timing on both intake and exhaust valves. so it flows better. fuel economy might go down, but i think thats it. also to answer the question about the head and ecu....i think you have to have the ecu from the k20a2 motor or else it might not work. i could be wrong...but thats what i heard. someone correct me on that if i am wrong.

yes you have to have the ecu and harness from the a2 and also the immobilizer from it..

and dont even worry about fuel economy... i boosted my 2k3 si and still got 25mpg in the city.. now im down to 16mph in the Z

yes, it is possible ... yes, it is recommended to bump up the compression ... I believe the a3 puts out 9.6:1 compression while the type S puts out 11.0:1 ...

just watch that redline the bottom end a3 was not designed to rev as high as the a2

you dont need the harness or the immoblizer from the type S, just the ECU.

Thanks for the help. I found the TODA and Mugen head gaskets from www.jhpusa.com. The mugen one is only 0.2 and the TODA one is 0.4 so brings it up to 10.2:1 which is a little closer to the 11:1 for the type s. The reason I ask is because I got a really good price for a K20a3 at $1600 (Canadian). Can't say no to that price. I figure that with the motor out I'd be able to swap the gasket and head myself and have it all ready to go in the car.
Just another question. Does anyone here have a good source for K series motors. I know a lot of people say ebay but not much there.

Dude where did you get a K20a3 for $1600 (CAN)? PM me I will likely be in the market for one next spring. Does that include the tranny as well?

Perhaps the head swap would work without the ECU and harness with the VAFC 2. This is the case for a head swap between a DX/LX head swap to EX Vtec. Would the head swap between the a2 and a3 K20 work similarly?

http://www.7thgencivic.com/forums/sh...d.php?t=169411

**** i paid 1300 for my A3, tranny, RSX seats, subframe, wiring harness, etc.

damn...any way that i could get a price like that. i really wanna swap...then maybe boost....but not til much later.

I found this car in some back woods junk yard owned by some indian dude, though i would never find a car like this there.