SKU: 99649770818

1649CI 1970-1981 Pontiac Buick and Olds "11 Bolt" water pump

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Description

1649CI 1970-1981 Pontiac Buick and Olds "11 Bolt" water pumpClassic Pontiacs run hot. Flowkooler designed a high flow 11 bolt pump with a CNC machined billet impeller with increased vane count and a reduced clearances between the backing plate and impeller vanes. It achieves greater flow rates, higher head pressure and a more efficient flow and it can be used with the serpentine conversion kits. The impeller color is due to Type II Class II military grade surface coating which protects against corrosive

Classic Pontiacs run hot.  Flowkooler designed a high flow 11 bolt pump with a CNC machined billet impeller with increased vane count and a reduced clearances between the backing plate and impeller vanes.  It achieves greater flow rates, higher head pressure and a more efficient flow and it can be used with the serpentine conversion kits. 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 Olds Rocket 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!

Reducing the gap between the backing plate and the impeller

Way back when the internet was young a George Kujanski made a statement on a forum about his experience in reducing clearance between impeller vane and backing plate.  Ever since our phones ring with questions about the clearance.  George was correct; when you reduce the clearance in a centrifugal pump you will increase the pressure differential and, concomitantly. increase the flow.  We machine taller impeller vanes into our pumps for this very purpose.  However as a manufacturer, we cannot machine each pump for the myriad of aftermarket plates and/or distorted, warped or corroded OE plates,  Furthermore, we cannot ensure that the person modifying has any experience in forming metal.  For this reason we will not make a recommendation beyond; "as close as you can get without touching."

George pressed his plate to a .100" clearance and reported anecdotally, "a drastic change in my engine temps with no other changes".  As a frame of reference, this is roughly the thickness of three sheets of paper.  If you elect to close the impeller-to-plate gap you have George's blessing. 

N.B.  Clearances that results in an impeller vane to backing plate interference will cause friction and failure and so we (unlike George) cannot recommend a specific clearance.  Owner modifications to the Pontiac part design are performed at the owner's discretion and FAILURE TO MAINTAIN ADEQUATE CLEARANCE WILL VOID ALL WARRANTY.

*Note: Do not buy this pump for the 1969 400 blocks with casting #9796351.  The 1969 400 pump measures 4" and the correct pump is 1647

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 4-1/2"
Other Special Features:
  • 16 Blade Machined Aluminum Impeller System
  • Impeller is surface coated with Military Grade Type II anodized finish
  • Backing plate sold separately.
  • See pump 1647 for casting #9796351 made in 1969
  • May be used with Pontiac V-8 Serpentine Conversion 326, 350, 389, 400, 455
  • Alternative Part Numbers 10008553, 12300305, 12307872, 12309445, 478126, 482138, 488152, 488296, 488377, 9790522, 9799124
Parts Contained in Box:
Mounting Gaskets, Installation Sheet, FlowKooler Decal
Make Model Year Block CID Liters
BUICK CENTURY 80-79 V8 301 4.9L
BUICK CENTURY 81-80 V8 265 4.3L
BUICK ELECTRA 1980 V8 301 4.9L
BUICK ESTATE WAGON 1980 V8 301 4.9L
BUICK LESABRE 1975 V8 403 6.6L
BUICK LESABRE 80-77 V8 301 4.9L
BUICK REGAL 80-79 V8 301 4.9L
BUICK REGAL 81-80 V8 265 4.3L
BUICK SKYLARK 1977 V8 301 4.9L
OLDSMOBILE 98 1975 V8 403 6.6L
OLDSMOBILE CUSTOM CRUISER 1975 V8 400 6.6L
OLDSMOBILE DELTA 88 1975 V8 400 6.6L
OLDSMOBILE DELTA 88 1979 V8 301 4.9L
PONTIAC ACADIAN 1969 V8 350 5.7L
PONTIAC BONNEVILLE 1969 V8 428 7.0L
PONTIAC BONNEVILLE 1970 V8 350 5.7
PONTIAC BONNEVILLE 1977 V8 350 5.7L
PONTIAC BONNEVILLE 74-70 V8 350 5.7L
PONTIAC BONNEVILLE 76-70 V8 455 7.5L
PONTIAC BONNEVILLE 78-69 V8 403 6.6L
PONTIAC BONNEVILLE 80-77 V8 301 4.9L
PONTIAC BONNEVILLE 81-80 V8 265 4.3L
PONTIAC CATALINA 1973 L6 250 4.1L
PONTIAC CATALINA 73-70 V8 350 5.7L
PONTIAC CATALINA 76-70 V8 455 7.5L
PONTIAC CATALINA 77-70 V8 403 6.6L
PONTIAC CATALINA 77-76 V8 350 5.7L
PONTIAC CATALINA 78-70 V8 400 6.6L
PONTIAC CATALINA 80-77 V8 301 4.9L
PONTIAC CATALINA 81-80 V8 265 4.3L
PONTIAC EXECUTIVE 1970 V8 350 5.7L
PONTIAC EXECUTIVE 1970 V8 455 7.5L
PONTIAC EXECUTIVE 70-69 V8 400 6.6L
PONTIAC FIREBIRD TRANSAM 76-70 V8 350 5.7L
PONTIAC FIREBIRD TRANSAM 76-71 V8 455 7.5L
PONTIAC FIREBIRD TRANSAM 79-70 V8 400 6.6L
PONTIAC FIREBIRD TRANSAM 81-77 V8 301 4.9L
PONTIAC FIREBIRD TRANSAM 81-80 V8 265 4.3L
PONTIAC GRAND AM 75-73 V8 350 5.7L
PONTIAC GRAND AM 75-73 V8 400 6.6L
PONTIAC GRAND AM 75-73 V8 455 7.5L
PONTIAC GRAND AM 80-78 V8 301 4.9L
PONTIAC GRAND LEMANS 1977 V8 301 4.9L
PONTIAC GRAND LEMANS 76-75 V8 455 7.5L
PONTIAC GRAND LEMANS 77-75 V8 350 5.7L
PONTIAC GRAND LEMANS 77-75 V8 400 6.6L
PONTIAC GRAND LEMANS 81-79 V8 301 4.9L
PONTIAC GRAND LEMANS 81-80 V8 265 4.3L
PONTIAC GRAND PRIX 1970 V8 350 5.7L
PONTIAC GRAND PRIX 74-72 V8 350 5.7L
PONTIAC GRAND PRIX 76-70 V8 455 7.5L
PONTIAC GRAND PRIX 77-70 V8 400 6.6L
PONTIAC GRAND PRIX 77-76 V8 350 5.7L
PONTIAC GRAND PRIX 80-77 V8 301 4.9L
PONTIAC GRAND PRIX 81-80 V8 265 4.3L
PONTIAC GRAND SAFARI 1977 V8 301 4.9L
PONTIAC GRAND SAFARI 74-71 V8 350 5.7L
PONTIAC GRAND SAFARI 76-71 V8 455 7.5L
PONTIAC GRAND SAFARI 78-71 V8 400 6.6L
PONTIAC GRANDVILLE 75-71 V8 455 7.5L
PONTIAC GRANDVILLE 75-72 V8 400 6.6L
PONTIAC GTO 73-70 V8 350 5.7L
PONTIAC GTO 73-70 V8 400 6.6L
PONTIAC GTO 73-70 V8 455 7.5L
PONTIAC LAURENTIAN 1976 V8 403 6.6L
PONTIAC LAURENTIAN 1976 V8 455 7.5L
PONTIAC LAURENTIAN 1981 V8 265 4.3L
PONTIAC LEMANS 76-71 V8 455 7.5L
PONTIAC LEMANS 77-70 V8 350 5.7L
PONTIAC LEMANS 77-71 V8 400 6.6L
PONTIAC LEMANS 81-77 V8 301 4.9L
PONTIAC LEMANS 81-80 V8 265 4.3L
PONTIAC PARISIENNE 1976 V8 400 6.6L
PONTIAC SAFARI 1970 V8 350 5.7L
PONTIAC SAFARI 1976 V8 455 7.5L
PONTIAC TEMPEST 1969 V8 403 6.6L
PONTIAC TEMPEST 1970 V8 350 5.7L
PONTIAC VENTURA 1977 V8 301 4.9L
PONTIAC VENTURA 74-72 V8 350 5.7L
STUTZ BLACKHAWK 74-70 All All All

 

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SKU: 99649770818

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Reviewed in the United States on May 29, 2026
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Amazon Customer
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★★★★★ 1
wrong size of metal components. incorrect items. non functioning
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The owner of this product sent me the incorrect pieces when I tried to install. It didn’t fit. The pieces were missing holes and once I connected the wrong pieces after knowing now they’re stuck and I can’t return them even though Amazon was kind enough to refund me. I just want to warn people this product is such a disappointment because it looks good. It’s good price, but you can’t even assemble the thing very disappointed.
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