There’s no question the Gen 1 Chevrolet small block is one of the most widely engine-swapped platforms ever produced.
One area that frequently creates confusion for enthusiasts is selecting the correct water pump. Both the Gen 1 small block and GM big block engines were produced with different pump configurations, and choosing the wrong style can lead to fitment issues and alignment problems.
How Do I Know if My Water Pump is Short or Long?
Measure from:
SBC SWP: 5-5/8″ (~143mm)
SBC LWP: 7.00″ (~178mm)
