Question on belt length with new pulleys

Boxcars

Banned
Joined
Sep 4, 2004
I just bought billet crank and water pump pulleys. The crank billet pulley is exactly the same circumference as the factory unit, but the new water pump seems to be about a 1/4" less in diameter. My original belt had some slack with the new pulleys enough so I didn't bother to start the car. Any opinions on what I should try first? 1" shorter or 2" shorter? TIA
 
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