rj911

I have a 73 sbc, when i took the engine in for rebuild, it was complete with the fan and pullies intact. The engine builder tore everything down and said the water pump was bad, i purchased a new short water pump for it, but now when i attempt to put the fan pulley on, it hits the pump. I dont know it there was any spacers behind the pump, the builder says there wasnt. It is the same pulley that came off the engine. I bought a second short style water pump, same problem. Does anyone know if there are supposed to be soacers behind the pulley ? The pump measures 5-5/8 from mount face to impeller face where the pulley mounts. According to my research, this is correct.

MISTERZ06

not sure hope this helps

http://www.zip-corvette.com/68-82-c3...mp-pulley.html

https://www.summitracing.com/experta...ive/answer/913


........................................ tom

rj911

Thanks, I checked it out, its pretty much what I had already known. Im just stumped as to why my pulley that came off now doesnt fit the water pump, it hits the pump before its seated on the impeller shaft. It IS a short pump, measures 5-5/8. Its kind of making me crazy. I dont want to just keep buying pumps until one works, its time consuming and a pain to have to return them. Who would have thought that something as simple as a water pump and pulley would be the challenge after doing a frame off !

MISTERZ06

seems like it is the wrong pulley

http://www.zip-corvette.com/68-82-c3...ey-spacer.html

http://www.ecklerscorvette.com/corve...1971-1982.html

http://www.zip-corvette.com/68-82-c3...mp-pulley.html
........................................ ........ tom

MISTERZ06

1972 350ci/200hp 4spd, power steering, no AC, no smog pump
short water pump
........................................ tom

7T1vette

Tell the engine builder to figure it out "on his dime". He's the one who said the pump was bad (how the heck he knows that, IDK); he should have spec'd a proper replacement for what you GAVE HIM in the first place.

rcread

How much more space do you need? When I replaced my water pump I had to grind a bit of material away on the new one. It lasted 18 years until I replaced it with a reverse rotation because of the serpentine belt system on the new engine.

thb72

The pulley is fine. A corvette pump is different than a standard short pump. it should have a 3/4 shaft and the impeller face should be about 3/16 farther from the block. Research the archive on the forum the information is there.

MelWff

How about posting the manufacturer and part number of the pump inorder to determine if you have the wrong pump

540 vette

Why all of a sudden it would be the wrong pulley. It worked before he changed the water pump. Just wondering.

Cool95vette

How is it lined up with the other pulleys? Does it look like it needs to go on fully to line up with them?

Peterbuilt

You need a Corvette specific water pump, here are the dimensions.

Big2Bird

No spacers when stock. But Moroso does make shims to correct pulley/belt alignment.
A friend had a 454 that ate belts. I realigned all the pulleys with shims, and no more issues.

Dynra Rockets

I had a similar problem when I purchased an aftermarket aluminum pump. I clearanced the pump body about .030" with a dremel and added a small shim to the backside of the stock pulley. No biggie.

MISTERZ06

i looked at my original water pump on my 1972, 350/200hp, power steering, no smog
AND the pump had a space ground (from the factory) down at the very top where the pulley is

the ground/machined is right in front of that square plug
and the clearance from the top of the pulley to the water pump is very very small

sorry i did not take pics ................. tom