LS Steam Vent Adapters 3an 2pk

The LS Steam Vent Adapters 3AN 2pk by EARLS are essential components for modern LS engine builders and performance enthusiasts managing crankcase ventilation systems. These adapters solve a critical challenge in forced-induction and high-horsepower builds: directing pressurized blow-by gases safely away from the engine block without compromising reliability. Whether you're fabricating a custom intake manifold, upgrading an existing PCV system, or integrating turbocharger plumbing, quality steam vent adapters ensure proper exhaust routing and prevent oil carryover into your intake tract.

Each adapter in this 2-pack features a 3AN male port connection, the industry standard for high-flow hose fittings on contemporary motorsports applications. EARLS engineering delivers precision-machined aluminum or ductile iron construction designed to withstand boost pressure cycles and thermal cycling without weeping or port leakage. The 3AN sizing accommodates braided stainless steel or PTFE hose, allowing builders to run clean, organized valve cover vent lines to catch cans, separators, or manifold vacuum sources with minimal restriction and maximum flow capacity for sustained high-RPM operation.

LS engine platforms—including LS1, LS3, LSA, and LS7 variants—benefit significantly from aftermarket vent adapters when paired with upgraded valve covers or custom fabrication work. Installation requires only basic hand tools and wrench compatibility with your existing hose and manifold ports; no modifications to the block or cylinder head are necessary. This 2-pack covers both driver and passenger-side vent requirements on typical builds, making it the practical choice for single-engine swaps, race car projects, and street performance builds demanding reliable, leak-free crankcase evacuation.