Boy, this thread sure has gotten confusing! I thought that I was clear in my previous comments but I guess not. I will try to simplify and better explain myself
The 956 used a 2.8L 4-cam, 4-valve, twin-turbo motor that was mechanically injected using Kugelfischer injection. It had air-cooled cylinders and water-cooled heads. This motor never ran in IMSA but was used in Group C in Europe. You can consider this motor a precursor to the later 962C motor or an evolution of the earlier 935 motor, whichever floats your boat.
The 962 that was raced in IMSA in the mid/late '80's was a completely air-cooled, flat-fan, twin-plug, LARGE single-turbo motor that is what all of our air-cooled motors aspire to be when they grow up (well, mine at least
) This motor was built in 3.0L and 3.2L displacements and used Motronic injection (albeit much more advanced than the street car version).
The 962C from the late '80's/early 90's was the final engine version and was also built in either 3.0L or 3.2L displacement. I guess you could consider this an evolution of the earlier 956 motor. It was similar to the 956 engine, in that it was a 4-cam, 4-valve, twin-turbo motor BUT a couple of obvious differences were that it had water-cooled cylinders and heads and used a further updated version of Motronic.
Whether it be a 956 or 962C motor, the cylinders/heads were all 1-piece units and were removed/installed individually. There was never a "single" head for one bank. I suppose it may appear that way to some when the water jackets are fitted on the motor, but when the water jackets are removed the cylinders/heads do come off individually. Helidoc just did this, he should be able to confirm.
Is that a bit more clear or did I further confuse people?
Ralph
EDIT: The very first 962 air-cooled IMSA engines were single plug and had not yet been twin-plugged, not important in this discussion but something to mention before someone calls me out on it.
