EVIL ENERGY LS Stainless Steel Steam Vent Crossover Kit — Black, CNC Manifold & Leak-Proof Seals

EVIL ENERGY LS Stainless Steel Coolant Crossover Steam Vent Kit is a complete black-anodized steam port system that links front and rear LS steam ports to evacuate trapped air and improve coolant circulation.

This kit is engineered for GM LS-series engines and includes pre-bent 304 stainless lines, a CNC-machined aluminum manifold, leak-proof seals, and all necessary fittings for a tidy, durable installation. It’s compatible with a wide range of intake systems and comes with clear labeling for driver and passenger side tubing to simplify fitment. Built for heat resistance and corrosion protection, the kit helps reduce hotspots and supports consistent coolant flow during demanding use.

How does the steam vent kit improve coolant flow?

The crossover connects the factory front and rear steam ports so trapped steam and air pockets have a controlled path to escape. By allowing air to migrate away from head and block passages, coolant can fully occupy passages and transfer heat more effectively. This lowers localized temperatures and helps the thermostat and water pump maintain stable operating conditions.

• Links front and rear steam ports to remove air pockets
• Promotes even coolant distribution across the heads and block
• Reduces localized cylinder head hot spots for steadier temps
• Works with factory coolant system components without major modification

Will this fit my LS engine and intake?

The EVIL ENERGY kit is designed for common LS-family engines including LS1, LS2, LS3, LS6, LS7 and LSX applications. It’s compatible with many Gen‑3 style plastic truck and aftermarket intakes such as Holley, Pro-Flo, and Titan SR series (note: remote MAP sensor required for some Titan installs). It does not fit Gen‑4 truck intakes.

• Fits LS1/LS2/LS3/LS6/LS7/LSX engine families
• Compatible with Holley, Pro-Flo, Titan SR, Super, Sniper and similar intakes
• Not compatible with Gen‑4 truck-style intakes
• Remote MAP sensor may be required for certain Titan SR installs

What comes in the box and how difficult is installation?

The kit ships as a complete assembly with CNC aluminum manifold, pre-formed stainless lines, AN fittings, O-rings, PTFE tape, and small shims for leakproof sealing. Tubes are labeled driver and passenger to reduce guesswork, and an instruction sheet outlines the steps. A basic set of hand tools and attention to sealing details will have most installations completed quickly; professional help is recommended if internal aluminum plugs must be removed from LS3/L92 heads.

• Includes manifold, stainless lines, AN fittings, O-rings, PTFE tape and shims
• Pre-labeled lines for driver and passenger sides to speed installation
• Instructions provided; basic tools usually sufficient
• Care required when removing LS3/L92 factory plugs to avoid metal debris

How durable is the kit under high heat and racing conditions?

Materials were chosen for longevity: 304 stainless tubing resists corrosion from coolant, and the anodized CNC aluminum manifold withstands heat and vibration. The fittings and seals are specified to keep the system leak-resistant during aggressive driving, track sessions or off‑road duty. Routine inspection is still recommended after heavy use or thermal cycling.

• 304 stainless tubing for corrosion resistance and strength
• CNC-machined aluminum manifold with black anodize finish
• Included O-rings and shims prevent leaks under stress
• Designed for repeated heat cycles common to performance driving

Who is this for? The EVIL ENERGY LS steam vent kit is aimed at builders and enthusiasts running LS-series engines who want a reliable way to evacuate steam and reduce coolant-related hotspots. It’s useful for daily-driven performance cars, high-output naturally aspirated engines, race builds, drift and drag cars, as well as off‑road trucks. If you value clean engine bay routing, durable materials, and a bolt-on solution to improve coolant consistency, this kit is well suited to your project.