ok im having trouble finding this d-series head code its pm3-18 and ive looked on d-series.org,honda-tech.com, **********.com, google.com, yahoo.com and even the page that has all the head codes and cant find this **** no where can anyone help me i dont know what block it came off of, the head was given to me from friend and dont know what it is from thanks if anyone can help

 

Found this if it helps its what someone else has posted so if its wrong Sorry LOL

89 CRX si
ZC SOHC
D16A6
Manual 5spd

PM3-18

 

thanks for helping ive already found that one but thankx it could be a zc or a6 head but i really want to search more

 

Are they not the same? I believe the cam is the same which makes me think the other internals are the same too.
So now I'm curious - why does it matter so much if it's ZC or D16? Not like you get any power gain.

 

Seriously...its not trivial. Same head casting, same internals. Don't believe the "slightly aggressive cam" nonsense you will find on the Internet in regards to the SOHC ZC. The only concern I can see you having is maybe the intake manifold. I believe it might have one less nipple for a vacuum hose. But if its installed and running on your car, then it should already be taken care of.