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Discussion Starter #1
I wanted to over drive my water pump pulley just a bit to get a little extra flow out of the pump. So with a 6 3/4" crank pulley and a matching size water pump pulley (1 to 1), I'm looking for a 5 1/2 to 5 3/4" water pump pulley, single V-groove.

For some reason, the over drive water pump pulleys are mostly for serpentine belts. Anybody know of any other GM models that use the same bolt pattern that came in a smaller size than the stock 6 3/4" water pump pulley....
 

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Long or short water pump?

Have you looked at what Moroso has to offer? March offered V-belt pulleys, they probably still do.

Steve R
 

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Assuming you have a short pump, the V8 Monza came with a 5.5 inch pulley. They're a little tough to find but occasionally they pop up.
 

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Discussion Starter #4
It is a short water pump and the Monza idea sounds good. Maybe just order a replacement pulley for a Monza through Rock auto or similar. Thanks for the idea.
 
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