Dohc ?
 

I have been searching for specs on the 16v heads. I would like to know the differences between the 3.0 and the 2.5 944 heads. Are the 928 DOHC heads a direct bolt on? And if so what are the specs on it.

Any comment that points me in the right direction would help.

Jason

I would check over at rennlist, A couple weeks ago they had a good thread with the same questions being asked.

I'll have to look around a little harder. From what I have found the intake and exhaust ports seem to be different between every model except the S2 and 968.

water passage on the front of the head going into the block is different between 2.5 and 3.0. The 2.5 one is inset towards the back of the head like a regular 2.5 head. 3.0 is even with front of block like the 2.7 motor.