1684 1966-1980 Chevy GM 366 427 water pump Mercruiser 7L gmc c15/c1500 suburban 81-79

7L gmc c15/c1500 suburban 81-79 V8 350 5

2L gmc v1500 suburban 1987 V8 379 6

8L checker marathon 78-69 L6 250 4

Impeller protected with Type II Class II Military grade surface coating

3L DODGE W100 PICKUP 74-72 V8 400 6

1684 1966-1980 Chevy GM 366 427 water pump Mercruiser 7L gmc c15/c1500 suburban 81-79Big blocks in big trucks need big cooling. We designed the 1684 pump for the 366 and 427 ci blocks. It has an impeller with an increased vane count and a reduced impeller vane clearance to take care of the problem. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller color is due to Type II Class II military grade surface coating which protects against corrosive fluids. FlowKooler introduced the first hi flow