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Street Race Truck More... The Toolbox

Chevy Small Block - Short vs Long Water Pump

9/19/2016
Before Purchasing Your New Pump

There are a just a couple basic things to consider when you’re purchasing a new water pump. Do you have a short or long style pump, and is it v-belt or serpentine-belt driven? Typically the small block Chevy (SBC) short pumps were used on ’68 and earlier passenger cars and light duty trucks. With the exception to Corvettes, the SBC long water pump was typically used on ’69 and up passenger cars and light duty trucks. Also, some of the later style aluminum water pumps with a serpentine-belt drive system used a reverse rotation pump.

One other thing to consider is the diameter of your water pump snout. Chevy used two common sizes, which were either 5/8-inch or the heavy duty 3/4-inch. Keep in mind that mixing and matching pulleys between short and long pumps can cause misalignment issues.

To be 100% sure before you order, the check is simple. Just set your original pump on a flat surface with the pulley flange facing up, take a straight edge and lay it across the pulley mount face and measure the distance between the block-side mount flange and pulley flange.

All applications can vary and pulley alignment can change on custom set-ups. In certain cases it may be handy to purchase water pump pulley shims or spacers to achieve the correct alignment.

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