LS Stainless Steel Steam Vent Crossover Kit

Unlock peak performance and reliability from your LS engine with our Stainless Steel 4-Corner Steam Vent System. Designed to vent trapped steam from all four corners of the cylinder heads, this system helps prevent hot spots, pressure build-up, and dangerous pre-detonation—especially critical for modified setups running boost, nitrous, or aggressive tunes.

Why You Need a 4-Corner Steam Kit:

The LS engine features steam ports in all four corners for a reason. Trapped steam increases internal pressure, elevates cylinder temps, and can cause:

• Unsafe tuning conditions
• Head gasket failures
• Lean cylinders (especially #7 and #8)
• Piston damage or failure

Whether you're upgrading your camshaft or building a full-blown forced induction setup, this kit is a proven solution to safeguard your engine.

Proven Performance, Clean Looks

Trusted by racers and enthusiasts alike, this crossover system resolves steam-related issues that plague rear cylinders in high-horsepower builds. Each kit includes:

• CNC-machined aluminum corner and center blocks (black anodized finish)
• Precision-bent 304 stainless steel crossover lines
• Pre-installed gaskets (included at no extra cost)
• Hand-built construction with quality and fitment in mind

Broad Compatibility:

This kit bolts directly to all LS-series engines and fits most popular intake manifolds, including:

• Holley Hi-Ram, Sniper
• Edelbrock Super Victor, Victor Jr., Pro-Flo XT
• Frankenstein Intakes
• Stock-style Gen 3 truck intakes
• May fit other style intakes like those listed above

-Clears factory knock sensors on Gen 3 engines
-Will NOT fit with Holley 300-132 or 300-129 intakes
-Not compatible with Low-Pro/ Stock plastic intakes (LS1, LS2, LS3, LS6, FAST 92/102) or Gen 4 truck intakes

Important Note for LS3 / L92 Heads:

These heads often have rear steam ports blocked with press-fit plugs. These can be removed using a punch from below (if heads are off) or carefully drilled from above. DO NOT enlarge the port diameter. Use a vacuum and a greased drill bit to prevent chips from entering coolant passages.

Kit Contents:

• (1) Center manifold block
• (4) CNC corner ports
• (4) Couplers
• (9) AN end fittings
• (4) Lag spikes