I have a 91 Civic DX hatch with a D15 in it. I would like to know if a D16 dual cam head out of an 86-87 integra will fit on my D15 block.

 

i'm not 100% sure but most d-series engines, like b-series engines are interchangable. so i wouldn't see why they wouldn't. the d15a that's in the crx hf, has the same head as the d16a that's in the crx si if i recall correctly. so they probably would work. i would just double check first.