Ok guys heres the question... my friend has a 94 si with a j spec d15b engine in it... now as far i as i know MOSTLY all D series parts are interchangeable right?? cuz he has a D16Y8 cyinlder head that he wants to put on it.. will it just bolt right up? will all the cooling passages and stuff all line up properly??

they will all fit that way but why? its a obd2 head, so the effort to swap over to obd1 wouldnt be worth it in my opinion. there isnt gonna be any realy gains except a little higher compression. the head is has now is vtec so that isnt the issue.

Why didn't he just keep the D16Z6 in that car in the first place then?

But he shouldnt have to switch over to the obd2, just the cylinder.....right?

Nope all he will basically be doing is keep his old wiring onto the new cylinder heaf. But let me ask you this why is he swapping it for? Was his old one damaged somehow?

save your money and buy a better motor (i.e. b-series)....

Quick stupid question for you guys, how do you figure out the engine type?? I'm sure I sound pretty dumb with this question, but I can't figure it out. Thanks

Nope all he will basically be doing is keep his old wiring onto the new cylinder heaf. But let me ask you this why is he swapping it for? Was his old one damaged somehow?
No not damaged. He just has a port and polished cylinder head with a 3 angle valve just sittin around in tha house that he wants to swap with an aftermarket cam and camgear

Quick stupid question for you guys, how do you figure out the engine type?? I'm sure I sound pretty dumb with this question, but I can't figure it out. Thanks
on the block beside the exhaust manifold u will see a number (d16z6,b16a2,b18c1,etc). hope that helps.