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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 / 1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars

1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars

$172.38

1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars
1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars
1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars
1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars
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1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars

$172.38

Flowkooler high flow pump 1620 for the Buick Nailhead has a CNC machined billet impeller designed with an increased vane count and a tighter impeller 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 and continues to improve impeller design. Why is increased flow so important to cooling a hot Pontiac 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 Aluminum
Number of vanes on Impeller 12 swept
Direction of Rotation CW
Fan Hub Height 3 9/16"
Shaft Diameter 5/8"
Hose Connections 1st 2nd
Gender m NA
Diameter 3/4" NA
Threaded No NA
Other Special Features:
  • Fits early-mid-1960s Buick V8 Nailheads with AC
  • 12 blade CNC Machined Aluminum impeller system
  • Impeller anodized with Military grade Type II Class II surface coating
  • Alternative Part Number 1389590,5513139, 58108, 58109, 58608, 513017, AW770, 181006, FP1316, 1309590, 42563, 1389590, 311063, C309590, 42563,
Parts Contained in Box:
Mounting Gasket, Installation Sheet, FlowKooler Decal
Make Model Year Block CID Liters
buick electra 63-62 All All All
buick electra 66-64 V8 401 6.6L
buick electra 66-65 V8 425 7.0L
buick lesabre 63-62 All All All
buick riviera 65-63 V8 401 6.6L
buick riviera 66-63 V8 425 7.0L
buick wildcat 66-64 V8 403 6.6L
buick wildcat 66-64 V8 425 7.0L

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1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars
1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars
1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars
1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars
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