May be used with Pontiac V-8 Serpentine Conversion 326, 350, 389, 400, 455 C.I.Impeller is surface coated with Military Grade Type II anodized finish.16 Blade Machined Aluminum Impeller System.The 1969 400 pump measures 4" and the correct pump is 1647 General Specifications: *Note: Do not buy this pump for the 1969 400 blocks with casting #9796351. Owner modifications to the Pontiac part design are performed at the owner's discretion and FAILURE TO MAINTAIN ADEQUATE CLEARANCE WILL VOID ALL WARRANTY. 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. If you elect to close the impeller-to-plate gap you have George's blessing. As a frame of reference, this is roughly the thickness of three sheets of paper. 100" clearance and reported anecdotally, "a d rastic change in my engine temps with no other changes". For this reason we will not make a recommendation beyond "as close as you can get without touching." Furthermore, we cannot ensure that the person modifying has experience in forming metal. However as a manufacturer, we cannot machine each pump for the myriad of aftermarket plates and/or distorted, warped or corroded OE plates. We machine taller impeller vanes into our pumps for this very purpose. George was correct when you reduce the clearance in a centrifugal pump you will increase the pressure differential and, concomitantly. Ever since our phones ring with questions about the clearance. 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. Reducing the gap between the backing plate and the impeller 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.įrom 0-3,300 RPM…Nothing Beats a FlowKooler! It achieves greater flow rates, higher head pressure, 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.įlowKooler introduced the first hi flow pumps and continues to improve impeller design. Casting Number 9796351, date code H158 A GM 9796351 4' hubs, 11 bolt This is brand new not rebuilt and no core is required. Flowkooler designed a high flow 11 bolt pump with a CNC machined billet impeller to increased vane count and reduced backing plate-to-impeller vane clearance. Pn - INL15409 - 1pc 1969 (all Models), ,, ,, Trans, ,, , CID, CID All V8 Early Factory Correct Short Neck Number Matching Water Pump with cast impeller.
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