I'm thinking about doing the crap shoot and buying a JDM engine. I'm really only going to use just the block.

Is it plug and play? There shouldn't be anything different right since everything else will be US?

 

the keg itself? sans the emissions stuff, should be almost 99% all the time.

 

the s4 JDM engines have rotor housings with the s5 spark plug location, which is actually good. other than that they are identical to the US spec.

S5 t2 blocks are the same worldwide.

the only differences are a couple of really minor emissions system things

 

Use the USpec parts off of your other engine if you can. UIM, LIM etc. that should help quite a bit.