Earl's Performance Water Pump Adapter Kits for GM LS Engines

Earl's Performance Water Pump Adapter Kits are precision-engineered cooling system solutions designed to bring professional-grade AN-style plumbing to GM LS engine builds. Factory OE water pumps rely on push-on barb connections for standard radiator hose attachment — a setup that falls short of the demands placed on serious performance applications. Earl's adapter kits eliminate that weakness, delivering secure, leak-free coolant routing trusted by race teams and performance builders worldwide.

This product line covers multiple configurations to suit a wide range of LS builds, including kits that convert water pump inlet and outlet connections to AN fittings, billet block adapter pairs that enable the use of a big block Chevy electric water pump on GM LS engines, and remote electric water pump plumbing solutions. This flexibility makes the lineup well suited for engine swaps, restomod projects, dedicated track builds, and high-performance street applications alike.

Key Features:

• CNC-machined billet aluminum construction for superior strength, durability, and corrosion resistance
• AN O-ring female outlet ports for secure, leak-free coolant routing back to the radiator
• Integrated 1/8" NPT ports on block adapters for steam tube plumbing — no radiator or water pump modifications required
• Broad LS compatibility — select kits include an O-ring adapter plate to upgrade early LS water pumps to the later, less restrictive thermostat style
• Anodized finish on aluminum components for lasting corrosion protection and a clean, professional appearance
• Complete kits include block adapters, gaskets, and all necessary mounting hardware

Multiple Configurations Available:

• Water pump inlet/outlet AN conversion kits for standard LS water pumps
• Billet block adapter pairs for big block Chevy electric water pump installation on LS engines
• Remote mounted electric water pump plumbing kits with adjustable coolant cross-over tubes

Earl's Performance has been a trusted name in performance fluid delivery systems for decades, having pioneered aviation-derived fluid transfer technology for the automotive performance market. These LS water pump adapter kits reflect that legacy — simplifying cooling system plumbing while delivering the fit, finish, and reliability that top race teams and serious performance builders have come to expect. Select the configuration that matches your water pump setup and AN fitting requirements.