1996-2007 GM Truck Coolant Pumps

Meziere's high flow electric "street" water pump for the LS1 and LS6 engines is here! Track, dyno, and most importantly, street testing, has proved engines run cooler at low speeds and gain high end horsepower when running Meziere's bolt on LS1/LS6 pump. In addition to the released power, you get to keep all of your factory accessories. Taking quality to the extreme, the WP319 features a dual bearing belt idler, billet parts throughout, and a “weather-tite” electrical connection. The pump is backed by a two-year warranty. 160 degree thermostat and new water pump gaskets recommended.

Also available are custom inlet housings in your choice of polished, red, blue, black, or chrome.

Evans Cooling Systems, Inc. has expanded their product line with the release of a high flow pump and pulley combinations for the GM LS1/LS6. Evans EP30913 Pump and Large Pulley (E3919) is now available for demanding engine RPM applications. The pump has been designed to increase flow 20% more than the OEM style replacement pumps, and maintains equal flow to both cylinder banks at any engine RPM. Evans improved design includes an engineered impeller, a billet pulley hub, heavy duty roller bearing and ceramic shaft seal. The 8 vane scrolled impeller design reduces parasitic horsepower loss at high RPM. Evans pumps are machined for correct clearance to accommodate Evans Small LS1 pulley, Evans Large LS1 pulley is a direct bolt on to an Evans pump. Evans has also applied this technology to the GEN III truck pump. (EP30914)

Evans Small pulley (E3910) is designed to work with the OEM crank pulley. This Pulley design maximizes cooling capacity by increasing coolant flow on factory applications more effectively then stock pulley combinations. Evans Large pulley (E3915) increases performance when using an under-drive crank pulley. Evans Small and Large pulleys are 8-rib compatible. Optimal Pump RPM range is 2500 - 6500. Pump flow (gpm) is maximized at 5500 pump RPM. For sustained high RPM applications our suggested combination is Evans Large Pulley and a 25% under-drive crank pulley. The pulleys are available as billet aluminum or anodized hard coat. Refer to LS1 Pump RPM vs. engine RPM to compare pulley drive ratios.

Evans also recommends the use of their modified thermostats, available in 160ºF and 180ºF temperature settings. The modification increases the flow up to 55% more coolant than other after market thermostats and maximizing the cooling advantage of the Evans EP30913 Pump. Evans LS1 Thermostats can also be used on all OEM LS1 pumps. Pump pulley and thermostat may be purchased separately or may be assembled for your specific application.

Note: Evans coolant pumps can only be used with Evans NPG+ or NPG-R waterless coolant.