Parts interchangable?

Will intake and exhaust manifolds off of 91 2.3 H.O. work on 92 2.3 SOHC motor?

No. the 91 HO is a DOHC, but if you get an HO head then that would work.

Will the H.O. head work on my SOHC motor?

Yea it would work on the block. but you would have to do some work, like a new computer and some other things im unsure of.

check out www.quad4fourms.com

Yesterday I purchased a 91 Grand Am DOHC H.O.
Previous owner thinks engine is locked up. Very good condition. I paid 150 bucks. If motor is terminal I want to beef up my 92 SOHC.