Whew! I have just been throught the ringer thrice trying to get the correct water pump for my 71 Cutlass w/o AC. Turns out mine takes the shortest one like was used on the 70 with HD cooling. Now, I am a little concerned with the space between the water pump pulley and the crankshaft pulley. It looks like it's about 1/8 of an inch betwen the two. Is that correct? Does anyone know the specs on this?

 

The edges sit close to one another, but the sheaves should line up.

- Eric

 

1970 cars with HD cooling used the same LONG water pump as A/C cars. In any case, there are only three different water pump lengths. Frankly, I'm a little mystified as to why this seems to be a perennial problem for people.

https://classicoldsmobile.com/forums...p-lengths.html