300 Series Electric Water Pump with Idler Pulley Small Block Ford

Name: 300 Series Electric Water Pump with Idler Pulley Small Block Ford
Brand: MEZIERE
SKU: 680-WP312B
Price: 913.09 USD
Availability: InStock

^$913⁰⁹

Ships on 09/28/2026

Lowest Price Guarantee

Ford - Small Block

Small Block Ford
Freewheeling Idler Pulley for 5.0/5.8L (pre-94) Stock Serpentine Belt Routing Configuration
55 GPM
Blue Anodized Finish

Innovative design makes for an easy installation. Unbolt your factory pump and bolt on an easy 11-14 horsepower with this street style water pump. These pumps share the feature of 55 gallons per minute flow. The WP312 water pump has a free wheeling idler pulley making this pump fully street ready and 5.0L enthusiast a dream come true. An idler is incorporated onto the WP312 pump so your belt routing remains in its stock configuration. The WP311 has all the same features without the pulley making it perfect for racing applications. Features driver & passenger side inlet ports. Heater & bypass fittings included. 1-3/4' NPT inlet fitting included.

Note: Will not fit "short water pump" timing covers; 1992 & up T-Bird, Cougar, Explorer, All '94 & '95 Mustangs, and early Lightning F-150s.

Features:
Fits small block Ford Windsor and 5.0 models pre 1994
Idler design lets you keep all of your serpentine belt driven accessories
Suitable for street or drag strip use - 3000+ hour life expectancy
Show quality finish - hard clear anodized pulley
Standard motor provides 55 gallons per minute free flow rating
All stainless steel hardware included
Ports provided for heater and bypass
Inlet fitting, heater and bypass fitting included
Driver's or passenger's side lower hose connection
Stainless steel large diameter main shaft with high performance ceramic seal
Alternate inlet fittings available

Technical Specifications:
Belt Drives: If you are running a cam belt drive on your small block Ford, you will most likely need the WP173 pump. This pump will not fit Yates, Danny B, Jessel, or Race Master belt drives.
Finishing The System: This pump is supplied complete with gaskets, hardware and fittings. No additional items should be necessary.
Amperage draw: Under normal use the pump will draw 11-12 amps.
Overall Height Dimension: The standard pump is 6.78' long from the mounting surface to the tip of the pump.
Pump Weight: This application weighs 10.2 lbs.

Additional Notes: The standard 35GPM pump is suitable for normally aspirated engines up to 650HP. Supercharged, turbocharged and high compression, high horsepower applications should use the 55GPM High Flow pump only. This model does not accept heater or bypass hoses as a standard.