I can believe that the reverse flow cooling systems may have gotten some parts boys confused but they should at least check the old sources. Attached is an exerpt from an old parts book that looks to me like Pontiac used the same pump from 55-63 which covers years both before and after the change in flow direction. So the change must have been done with the passages in the timing cover and not with the pump. I still believe all pumps turned the same direction and it's the parts boys that are confused.
Yes - the four cylinder did get another pump which would be the small vane version for the different timing cover housing.
|