PQY LS Coolant Crossover Steam Vent Kit — 4‑Port Complete Stainless & Aluminum, Universal LS Fit

This PQY kit swaps into LS V8 intake manifolds (LS1, LS2, LS3, LS6, LS7, LS9, LSX) to restore proper steam venting and coolant crossover function without fabricating custom hard lines. It combines 304 stainless tube runs, aluminium steam connectors and multiple fittings to route pressure away from the crossover and let your radiator cap do its job, reducing the chance of steam pockets and pressure build-up in the intake area.

How does the PQY kit restore coolant crossover venting?

The kit replaces the damaged or missing factory steam ports with dedicated manifolds and fittings that guide trapped steam out of the intake crossover. It uses tapered-thread connectors for a secure seal and stainless tubing to resist corrosion and heat.

• Includes 5 center manifold pieces and a corner manifold for correct routing.
• 304 stainless tube resists rust and retains shape under heat.
• Tapered-thread fittings reduce leak risk and accept thread sealant.
• Designed to mate with common LS radiator cap vent locations.

What parts come in the complete 4‑port kit and how do they fit together?

The package contains manifold sections, couplers, end fittings and lag spikes so you can assemble a continuous vent run across the intake. The pieces are modular to match various LS intake shapes and let you route vents where there is clearance.

• 5 center manifold segments plus 1 corner manifold for flexible layouts.
• 4 couplers to join tube sections and direct flow to the exit point.
• 9 end fittings to adapt to radiator cap or hose connections.
• 4 lag spikes for secure mounting to the intake or chassis points.

Is the PQY steam vent kit easy to install and safe to use?

Installation is straightforward if you follow safety steps and work on a cold engine. The design avoids needing a traditional hard‑line under some intakes, but you should verify fitment and clearance on your vehicle before final installation.

• Install only on a cold engine to avoid hot coolant hazards.
• Tapered threads tighten for a leak-resistant connection; use thread sealant if needed.
• Check under-intake clearance — some LS intakes lack room for hard lines.
• Universal fit for LS1/LS2/LS3/LS6/LS7/LS9/LSX families, but confirm sizes first.

Will this kit work with my 5.3 or 6.0 LS engine?

The PQY kit is commonly used as a replacement for 5.3 and 6.0 LS steam vent assemblies and is compatible with many stock and aftermarket intakes. Always measure the existing steam port locations and tubing diameters to ensure seamless installation.

• Compatible with multiple LS platform engines when dimensions match.
• Works as a replacement for OEM 5.3 and 6.0 steam vent setups.
• Offers modular parts to adapt to slight intake geometry differences.
• Not a direct-fit for every intake—pre-check port spacing and clearance.

Who this is for: The PQY LS Coolant Crossover Steam Vent Kit is aimed at LS owners, tuners and mechanics who need a durable, modular steam vent solution without fabricating custom hard lines. It's useful for restoring proper coolant venting on stock or mildly modified LS intakes, for replacement of corroded OEM fittings, or for builders who want a corrosion-resistant stainless and aluminium vent path. If you own an LS1, LS2, LS3, LS6, LS7, LS9 or LSX engine and want a complete 4‑port kit with multiple fittings and mounting hardware, this PQY kit offers a practical, serviceable option—just confirm port sizes and install only on a cold engine.