One's engine code starts with a 1,the other with a 2.


Seriously though,I think the 2j is a little bigger.And some differences in the head/block castings i'm sure.

I don't know shit about supra's,although I have heard of people using a 1j head on a 2j shortblock,i'm assuming to raise/lower the compression.


I'll let someone more supra oriented chime in to 100% everything.