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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 / 1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4" shaft water pump

1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4" shaft water pump

$141.78

1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4
1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4
1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4
1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4
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1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4" shaft water pump

$141.78

Corvette running hot? Flowkooler designed a high flow water pump with a CNC machined billet impeller to increased vane count and a reduced casting-to-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 pumps for the inline 6 and continues to improve impeller design. Why is increased flow so important to cooling a hot Small Block Corvette 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 16 CNC Aluminum
Direction of Rotation CW or CCW
Fan Hub Working Height 5 13/16"
Shaft Diameter 3/4"
Hose Connections: 1st 2nd
Gender F F
Diameter 3/4" 7/8"
Threaded Yes Yes
Other Special Features:
  • 16 blade CNC Machined Aluminum impeller
  • Protected from corrosion with military grade surface coating
  • Impeller blades at right angles to shaft; bi-directional impeller
  • Upper hose inlet contained in square boss 1 1/8" tall
  • 3/4" shaft
  • Alternative Part Numbers 10048921, 12307829, 12458924, 12458925, 12522037, 14105938, 3998205, 6258551
Parts Contained in Box:
Mounting Gaskets, Installation Sheet, FlowKooler Decal
Make Model Year Block CID Liters
chevrolet caprice 68-61 V8 327 5.4L
chevrolet corvette 1980 V8 305 5.0L
chevrolet corvette 82-71 V8 350 5.7L
chevrolet impala 68-61 V8 327 5.4L
chevrolet med/hd series 40 80-73 V8 350 5.7L
chevrolet med/hd series 50 90-73 V8 350 5.7L
chevrolet med/hd series 60 90-73 V8 350 5.7L
chevrolet med/hd series c50 86-80 V8 350 5.7L
chevrolet med/hd series c60 1983 L6 374 6.1L
chevrolet med/hd series c60 1983 V8 366 6.0L
chevrolet med/hd series c60 90-80 V8 350 5.7L
gmc c5000 86-80 V8 350 5.7L
gmc c5000 89-87 All All All
gmc c6000 90-80 V8 350 5.7L

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1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4
1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4
1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4
1683 1961-1990 Chevy GMC and 1971-1982 Corvette C3 C4 305 327 350 3/4
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