GM LS Hardline Steam Tube Kit

The GM LS Hardline Steam Tube Kit is a precision-engineered cooling system component designed for LS engine swap builds and high-performance modifications. Whether you're installing an LS powerplant into a classic truck, street rod, or race application, this EARLS hardline steam tube kit manages coolant circulation between the engine block and heater core or overflow system with OEM-level reliability. Built for builders who demand clean, leak-free plumbing that integrates seamlessly with modern LS architecture, this kit eliminates the need for improvised hose routing and ensures consistent coolant flow under sustained boost or street driving.

Constructed from premium aluminum tubing with precision-formed hard fittings, the GM LS Hardline Steam Tube Kit delivers superior durability compared to silicone hose alternatives, particularly in engine bays exposed to radiant heat from turbos, superchargers, or tight compartment layouts. EARLS hardline systems feature vibration-resistant routing, factory-style connection points, and corrosion-resistant anodized or polished finishes that maintain their appearance through years of use. The fixed geometry design eliminates hose expansion under pressure cycles, reducing the risk of fitting separation or coolant loss—critical on street cars and track vehicles where engine shutdown isn't an option mid-event.

This kit fits LS1, LS2, LS3, LS6, and LSx engines across swap platforms including Chevrolet, GMC, Pontiac, and third-party applications. Installation requires basic hand tools and familiarity with coolant system layout; most experienced builders complete fitment in under two hours. Compatible with factory LS block configurations, aftermarket water pump housings, and both mechanical and electronic thermostat housings, the GM LS Hardline Steam Tube Kit represents a professional-grade alternative to restrictive OEM hoses or unreliable custom fabrication. Backed by EARLS' reputation for precision plumbing, this component delivers the reliability and appearance expected on show-quality or high-mileage performance builds.