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1677 1996-1999 Chevy GMC HUMMER 6.5L Diesel CCW water pump - bolt on pulley

$364.00

1677 1996-1999 Chevy GMC HUMMER 6.5L Diesel CCW water pump - bolt on pulley

$364.00

The 1677 is designed to outperform GM's higher flow rate "130 gpm" pump released in 1997.  GM grew the impeller diameter by 10% to outflow their earlier pump designs versions.  Most diesel owners simply look for that to determine if it is higher output or not.  We go a wee bit further.

Our impeller outperforms and outflows to help the 6.5L diesel run a little cooler under a load.  The impeller has an increased vane count, a reduced impeller vane clearance to the casting volute, a more open eye to permit greater flow and a ported shroud to build pressure in the eye and an appropriate B gap clearance to limit the potential of pressure pulsation or hydraulic shock.  

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 pumps and continues to improve impeller design. Why is increased flow so important to cooling a hot Chevy diesel engine? Because, it has been proven time and time again that reducing the cycle time between the heat source and the heat sink, creates more opportunities to shed heat and drop engine temperatures.

From 0-3,300 RPM…Nothing Beats a FlowKooler!

General Specifications:
Type of Material of Pump Body Cast Iron
Number of Blades on Impeller 10 CNC Aluminum
Direction of Rotation CCW
Fan Hub  flat
Hose Connections: 1st 2nd
Gender F F
Diameter 3/4"  3/4" 
Threaded No  NA
Other Special Features:
  • CNC Machined Aluminum impeller with 10 vanes
  • Protected with a Type II Military grade anodized surface coating
  • 1999-2004 6.5L Diesel with bolt on pulley
  • This pump has two hose connections 
  • Alternative Part Numbers 12456231, 12555711, 12555752, 12569281, 19168609, 50745093, 5745093, 88894035
Parts Contained in Box:

Mounting Gaskets, Installation Sheet, FlowKooler Decal

Make Model Year Block Liters Notes
AM General Hummer 1997 - 1998 V8 6.5L w/ Bolt-On Pulley
Chevrolet G30 1996 - 1996 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet C1500 1996 - 1998 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet C1500 Suburban 1996 - 1998 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet Express 2500 1996 - 1998 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet Express 3500 1996 - 1998 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet K1500 1996 - 1998 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet P30 1996 - 1998 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet C2500 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet C2500 Suburban 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet K1500 Suburban 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet K2500 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet K2500 Suburban 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet K3500 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet Tahoe 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
Chevrolet C3500 1997 - 1999 V8 6.5L w/ Bolt-On Pulley
GMC P3500 1994 - 1998 V8 6.5L w/ Bolt-On Pulley
GMC C1500 1996 - 1997 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC Yukon 1996 - 1997 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC K1500 1996 - 1998 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC C1500 Suburban 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC C2500 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC C2500 Suburban 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC C3500 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC K1500 Suburban 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC K2500 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC K2500 Suburban 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC K3500 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC Savana 2500 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley
GMC Savana 3500 1996 - 1999 V8 6.5L Dual Thermostat, w/ Bolt-On Pulley