LS Engine Steam Line -4 AN Alum Black Each

The LS Engine Steam Line -4 AN Alum Black Each from Trick Flow is a precision-engineered coolant bypass fitting designed for GM LS-series engine builds and high-performance modifications. This component manages coolant flow and steam venting in upgraded cooling systems, making it essential for builders who demand reliability under extreme operating conditions. Whether you're fabricating a custom engine bay, converting a LS platform into a non-GM chassis, or optimizing cooling efficiency in a race application, this aluminum steam vent fitting provides the secure, leak-free connection modern performance engines require.

Constructed from aluminum for weight savings and corrosion resistance, the LS Engine Steam Line features a -4 AN male connection specification, ensuring compatibility with standard braided hose and adapters throughout your cooling system. The AN (Army-Navy) standard thread format guarantees precise fitment and eliminates the guesswork common in improvised cooling setups. Trick Flow's manufacturing tolerances ensure that sealing surfaces mate correctly with included bolts, reducing the risk of air pockets and vapor lock in high-heat environments. The compact 4.15-inch length and minimal 0.04-pound weight make this fitting ideal for tight engine compartment layouts without compromising durability or pressure handling.

Fabricators, performance shops, and LS swap specialists will find this steam vent fitting indispensable for coolant system integration on LS1, LS2, LS3, and later-generation LS blocks. Installation is straightforward—bolt the fitting to the appropriate engine location using the included hardware and connect your -4 AN hose lines. This component is particularly valuable in high-boost applications, track vehicles, and engine conversions where OEM cooling paths have been removed or modified. Pair it with quality coolant hoses and a properly sized radiator to achieve optimal thermal management and system longevity.