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FlowKooler pumps patented impeller designs help stop engines from overheating and reduces engine temperature up to 30 degrees by doubling the flow of coolant and building system pressure.

Home / Products / 1690 1950-1955 Chevy GMC 235 261 Inline 6 water pump 4" tall with 3/8" groove pulley

1690 1950-1955 Chevy GMC 235 261 Inline 6 water pump 4" tall with 3/8" groove pulley

$139.00

1690 1950-1955 Chevy GMC 235 261 Inline 6 water pump 4
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1690 1950-1955 Chevy GMC 235 261 Inline 6 water pump 4" tall with 3/8" groove pulley

$139.00

Flowkooler designed a high flow water pump with a CNC machined billet impeller with increased vane count and a reduced casting-to-impeller vane clearance.  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 for the inline 6 and continues to improve impeller design. Why is increased flow so important to cooling a hot 235 or 265 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 CW
Hub Height 4"
Pulley groove belt width 3/8"
Hose Connections: 1st 2nd
Gender F NA
Diameter 11/16" NA
Threaded Yes NA
Other Special Features:
  • 10 vane CNC Machined Aluminum impeller 
  • Impeller protected with a military grade Type II anodized surface coating
  • Fits 235 & 261 L6 Chevys from 1955-62 but not the 4-1/8" trucks
  • Alternative Parts Numbers 10-823, 10823, 130-9710, 181176, 2-9526, 20027, 211075, 252-739, 2785372, 3774211, 42555, 51-2271, 512271, 55-11510, 5511510, 58-125, 58-126, AW108N, B309710, BWP-9526, BWP9526, CP108N, ELGWP108N, FP1130, N309710, NW108N, PWP-9526, T4053, W9526M, WP-9526
Parts Contained in Box:
Mounting Gaskets, Installation Sheet, FlowKooler Decal
Make Model Year Block CID Liters

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1690 1950-1955 Chevy GMC 235 261 Inline 6 water pump 4
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