Description
Part Number: WP419NMP
Meziere GM LS High-Flow Mechanical Water Pump (Offset Pulley)
Engineered for extreme off-road and circuit racing applications, delivering unmatched coolant flow and durability for GM LS / LSx V8 engines.
Key Features & Performance Highlights
- ☑ High-Flow 4″ Impeller: CNC-machined 6061-T6 billet aluminum impeller provides up to 5 to 7 GPM higher coolant flow off-idle than standard pumps.
- ☑ Billet Aluminum Construction: Machined from solid aircraft-grade 6061-T6 aluminum with a clear Type II anodised natural finish for ultimate corrosion resistance.
- ☑ Offset Pulley Design: Features an offset serpentine pulley layout designed to accommodate complex accessory drives and blower belt routing setups.
- ☑ Versatile Porting: Includes -08 ORB heater hose ports with block-off plugs installed and a -20 ORB outlet port compatible with Meziere WN-style fittings.
- ☑ Race-Proven Durability: Rated for up to 7,000 max pump pulley RPM and fully rebuildable for severe-duty motorsport use.
Technical Specifications
| Brand | Meziere Enterprises |
|---|---|
| Manufacturer Part Number | WP419NMP |
| Engine Compatibility | GM LS / LSx Engines (LS1, LS2, LS3, LS7, LSX Blocks) |
| Pump Type | Mechanical High-Flow Race Water Pump |
| Material & Finish | Billet 6061-T6 Aluminum / Natural Clear Type II Anodised |
| Rotation & Pulley | Reverse Rotation (Serpentine Belt) / Offset Pulley Configuration |
| Impeller Diameter | 4.00″ CNC-Machined Billet Impeller |
| Port Specifications | -20 ORB Outlet / -08 ORB Heater Ports (Plugs Included) |
| Max Recommended Pulley RPM | 7,000 RPM |
| Overall Depth & Weight | 5.95″ Depth / 11.60 lbs Approx. Weight |
What’s Included in the Box
- 1 x Meziere WP419NMP High-Flow Mechanical Water Pump Unit
- Pre-installed Serpentine Belt Offset Pulley
- Pre-installed -08 ORB Heater Port Block-Off Plugs
- Thermostat Block-Off Hardware / Mounting Seals
Built in the USA to rigorous motorsport standards, Meziere cooling components are trusted by top-tier off-road and circuit racing teams globally. As an authorised UK stockist, JP Racing provides official product support, technical guidance, and rapid UK delivery on all Meziere high-performance parts.


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