what are the different types of water pumps for pontiac motors up to 1981?

Question

can't get the pulleys to line up I know I have a mid 70's 400 and the water pump is later than 1969 but I can't
find a pulley that works every one is about a half inch off I bought a aftermarket set of underdrive pulley's from march performance and still the same problem the water pump is a half inch off there was no long or short water pump right they are all the same lenght right??? The only difference I know of is that pre 1968 the pumps have a 8 bolt design and after they have a 11 bolt design is that right???

Answer 1

Actually there was two main pumps for the older ones,, one was called a short shaft,,and one was called a long shaft,,the long shaft was the most popular,and it all depends on whether your car had power steering,,and air conditioning on it,,all the ones that used the long shaft usually had air,,and power steering on them also,,also some of them had a smog pump on them,,this was the main reason they used the long shaft,,most of the smog pumps got taken off and discarded down through the years,,but you still had to use the pump that had the long shaft,,this is the problem your having,,i own a repair shop in Tennessee,,and have been redoing some old cars in the past few years i to have run across the same problem you are having,,you can have a long shaft ordered for you ,,and it will work fine,,i had to use the long shaft on the one i was redoing hope this helps some.

Answer 2

did you happen to loose the aluminum spacer between the water pump output shaft, and the fan pulley?