I posted this in the all motor section but I think this would be a better place. We are currently planning on building a new engine and was told to use the k20a head. I see there is a k20a, k20a1, k20a2, k20a3. Are all of these the same casting or are each one different?

 

u want the k20a2 head from the rsx type s

 

also the k20a from japan is what came off the jdm type-r better casting. they used a finer sand for the ports to have a better finish

 

So it is infact a different casting? The ports are not a big deal at all they will be reworked completely. I thought it was the a2 I wanted. Thanks for the help guys.

 

The k20a head would be the best

 

I've heard the casing on all K's are the same, including K24's. as long as they ahve the LMA's.

 

i read on this through honda tuning that the finer sand treatment was only done on the r-models as was the hand porting done to the b-series type-r motors