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Good questions,
The difference between Euro & US 16V heads primarily is vavle size. The Euro 928S heads have 944 size valves. You can put 944 heads on a 928 but you must machine the water passages to except the 928 coolent crossover. I don't think after machine work you will be getting off much cheeper than what I am asking for my heads. 16V heads will fit on a 32V block and visa versa. 5.0L Euro Hybrid's have been dynoed to 370Hp, but 330 to 340Hp is a very reasonable expection.
I know this for sure though, if you put 944 pistons on 928 rods the pistons will not reach the top of the block. Also, I know if you put a 928 piston on a 944 rod your piston will pop out over the deck. The big end of a 944 rod is wider than a 928 rod. Every 928 rod I have ever seen is forged, most 944 rods are powered medal, unless they are 1983 MY or 951 rods. Both engines share the same size piston pin. I have not measured both but I do believe that rod leangth is the same for both engines. 928's have a higher deck height than 944's.
I understand what you mean when you say you are in a 928 hole. Been there!
Contact me when you are intrested. I am not planing to e-bay them anytime soon.
Cheers,
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Revis Rose
'84 944 NSRC
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