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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 / 1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5" water pump

1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5" water pump

$119.00

1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5
1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5
1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5
1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5
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1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5" water pump

$119.00

Flowkooler high flow pump 1621 has a 16 vane CNC machined billet impeller.  It is shrouded and ported and, with the increased vane count and a reduced impeller clearance, it really pumps the coolant.  It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller's 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  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 Blades on Impeller 16
Direction of Rotation CW
Fan Hub Height 4 1/2"
Shaft Diameter 5/8"
Hose Connections: 1st 2nd
Gender M NA
Diameter 3/4" NA
Threaded Yes NA
Other Special Features:
  • 16 blade CNC Machined Aluminum impeller
  • Anodized with military grade surface coating
  • Impeller chamber is directional to clockwise rotation
  • Pilot shaft extends 1" further than the flange surface
  • 86-87 Grand Nationals do not use the 33- series Robert shaw thermostat
  • See pictures that call out the casting "gusset" to be sure you get the right pump
  • Fits General Motors cars and the Buick Regal Grand National - Gasket varies slightly
  • Alternative Part Number 12307821, 1241336, 1242913, 1247079, 1257703, 25527355, 25527536, 5513111, 58114, 511556, 251174, 251639, 252582, AW1018, 71280, CWP450, 3818, 700810, P1007, 16006686, AP595, 170120, B595, P595, 98029, 143002, 1462056, 50595, P595AX, W828, P1007, 281677, 281677Q, 2282201, 18300, ELGWP1018, WP1018, 87674102902, FP1448, NP1007, WP189, 1301070, 43094, WP665A, 311020, 25527355, 25527536, 311020, HYT11020C, W1501, C301070, P1007, PW4, 43094, GWG07A, 623603, 3450, WP1354, 7093120, QAW1018, 70872, W872, 1020, PC409, 1501, WP595, 31808, FP1448, TVI1018, T4108, US1018, WH6062 
Parts Contained in Box:
Mounting Gasket, Installation Sheet, FlowKooler Decal
Make Model Year Block CID Liters
buick apollo 75-73 V8 350 5.7L
buick centurion 1973 V8 350 5.7L
buick century 77-73 V8 350 5.7L
buick century 79-78 V6 196 3.2L
buick century 81-75 V6 231 3.8L
buick electra 81-77 V8 350 5.7L
buick electra 84-80 V6 252 4.1L
buick estate wagon 1973 V8 350 5.7L
buick estate wagon 80-78 V8 350 5.7L
buick lesabre 80-73 V8 350 5.7L
buick lesabre 84-80 V6 252 4.1L
buick lesabre 85-76 V6 231 3.8L
buick regal 77-73 V8 350 5.7L
buick regal 79-78 V6 196 3.2L
buick regal 84-82 V6 252 4.1L
buick regal 87-75 V6 231 3.8L
buick grand national 87-84 V6 231 3.8L
buick riviera 78-77 V8 350 5.7L
buick riviera 84-81 V6 252 4.1L
buick riviera 85-79 V6 231 3.8L
buick skyhawk 1978 V6 231 3.8L
buick skyhawk 77-75 All All  
buick skyhawk 80-79 All All  
buick skylark 76-75 V8 350 5.7L
buick skylark 79-75 V6 231 3.8L
cadillac deville 82-80 V6 252 4.1L
cadillac eldorado 82-81 V6 252 4.1L
cadillac fleetwood 82-80 V6 252 4.1L
cadillac seville 82-81 V6 252 4.1L
chevrolet camaro 81-80 V6 231 3.8L
chevrolet caprice 85-80 V6 231 3.8L
chevrolet el camino 85-78 V6 231 3.8L
chevrolet impala 85-80 V6 231 3.8L
chevrolet malibu 83-78 V6 231 3.8L
chevrolet monte carlo 87-78 V6 231 3.8L
chevrolet monza 79-78 V6 196 3.2L
chevrolet monza 80-78 V6 231 3.8L
gmc caballero 84-78 V6 231 3.8L
oldsmobile 98 83-81 V6 252 4.1L
oldsmobile cutlass 81-77 V6 231 3.8L
oldsmobile cutlass 87-85 V6 231 3.8L
oldsmobile cutlass calais 84-78 V6 231 3.8L
oldsmobile cutlass cruiser 83-78 V6 231 3.8L
oldsmobile cutlass salon 81-78 V6 231 3.8L
oldsmobile cutlass salon 87-85 V6 231 3.8L
oldsmobile cutlass supreme 87-77 V6 231 3.8L
oldsmobile delta 88 85-77 V6 231 3.8L
oldsmobile omega 76-75 V8 350 5.7L
oldsmobile omega 79-77 V6 231 3.8L
oldsmobile starfire 1975 All All  
oldsmobile starfire 77-76 L4 140 2.3L
oldsmobile starfire 80-75 V6 231 3.8L
oldsmobile toronado 84-81 V6 252 4.1L
pontiac bonneville 1982 V6 252 4.1L
pontiac bonneville 80-78 V8 350 5.7L
pontiac bonneville 86-80 V6 231 3.8L
pontiac catalina 1981 V6 231 3.8L
pontiac firebird 1989 V6 231 3.8L
pontiac firebird 81-77 V6 231 3.8L
pontiac grand am 1979 V6 231 3.8L
pontiac grand lemans 81-77 V6 231 3.8L
pontiac grand prix 1982 V6 252 4.1L
pontiac grand prix 87-78 V6 231 3.8L
pontiac lemans 81-77 V6 231 3.8L
pontiac parisienne 85-83 V6 231 3.8L
pontiac phoenix 79-77 V6 231 3.8L
pontiac sunbird 80-76 V6 231 3.8L
pontiac ventura 1977 V6 231 3.8L
pontiac ventura 76-75 V8 350 5.7L

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1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5
1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5
1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5
1621 1973-1987 Buick Cadillac Chevy GM Olds Pontiac Grand National 196 231 350 4.5
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