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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 / 1687CI 1975-1977 Inline 6 cylinder 250/4.1L 4 1/4" tall water pump

1687CI 1975-1977 Inline 6 cylinder 250/4.1L 4 1/4" tall water pump

$111.18 $121.38

1687CI 1975-1977 Inline 6 cylinder 250/4.1L 4 1/4
1687CI 1975-1977 Inline 6 cylinder 250/4.1L 4 1/4
1687CI 1975-1977 Inline 6 cylinder 250/4.1L 4 1/4
1687CI 1975-1977 Inline 6 cylinder 250/4.1L 4 1/4
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1687CI 1975-1977 Inline 6 cylinder 250/4.1L 4 1/4" tall water pump

$111.18 $121.38

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If you have the 1975-1977 Chevy truck with a 250/4.1L you might be finding it runs a little hotter now.  You might also find heat cycling is occurring with your riser set-up.  We designed a impeller with an increased vane count and a reduced impeller vane clearance to take care of both problem.  It achieves greater flow rates, higher head pressure and a more efficient flow and squeezes that air out of your riser casting. 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 4.1L 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 Iron
Number of Blades on Impeller 8 CNC Aluminum
Direction of Rotation CW
Fan Hub Working Height 4-1/4"
Shaft Diameter 5/8"
Hose Connections: 1st 2nd
Gender M NA
Diameter 3/4" NA
Threaded No NA
Other Special Features:
  • 8 vane CNC Machined aluminum impeller
  • Protected from corrosion with a military grade surface coating
  • Fits Chevrolet Suburban, GM Suburban applications
  • If your hub height measures 3 7/8" tall - see pump 1777cw
  • If your hub height measures 3 15/16" tall - see pump 1686
Parts Contained in Box:
Mounting Gaskets,Installation Sheet, FlowKooler Decal
Make Model Year Block CID Liters
chevrolet blazer 77-75 L6 250 4.1L
chevrolet c10/c1500 pickup 77-75 L6 250 4.1L
chevrolet c1500 suburban 77-75 L6 250 4.1L
chevrolet c20/c2500 pickup 77-75 L6 250 4.1L
chevrolet c2500 suburban 74-71 L6 250 4.1L
chevrolet c30 pickup 1975 L6 250 4.1L
chevrolet g10/ g1500 van 77-75 L6 250 4.1L
chevrolet g20/ g2500 van 77-75 L6 250 4.1L
chevrolet g30/ g3500 van 1976 L6 250 4.1L
chevrolet k10/1500 pickup 1977 V8 305 5.0L
chevrolet k10/1500 pickup 77-75 L6 250 4.1L
chevrolet k10/k1500 suburban 77-75 L6 250 4.1L
chevrolet k20/k2500 pickup 76-75 L6 250 4.1L
chevrolet k5 blazer 77-75 L6 250 4.1L
chevrolet p30 van 1976 L6 250 4.1L
gmc c15/c1500 pickup 77-75 L6 250 4.1L
gmc c15/c1500 suburban 77-75 L6 250 4.1L
gmc c25/c2500 pickup 77-75 L6 250 4.1L
gmc c35/c3500 pickup 1975 L6 250 4.1L
gmc g15/g1500 van 77-75 L6 250 4.1L
gmc jimmy 77-75 L6 250 4.1L
gmc k15/k1500 pickup 77-75 L6 250 4.1L
gmc k15/k1500 suburban 77-75 L6 250 4.1L
gmc k25/k2500 pickup 76-75 L6 250 4.1L

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1687CI 1975-1977 Inline 6 cylinder 250/4.1L 4 1/4
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