WnSEu MSCRP AN4 Fuel & Brake Line Kit for LS Engines - Stainless Coolant Crossover & Steam Vent

WnSEu MSCRP AN4 Fuel Brake Line LS Stainless Coolant Crossover Steam Vent Kit is a tailored hardware set that routes AN4 fuel and brake lines and provides a stainless coolant crossover and steam vent solution for many LS-series engines.

This kit groups multiple hardwearing components designed for GM LS-family motors (LS1, LS2, LS3, LS6, LS7, LS9, LSX) to simplify plumbing upgrades during engine swaps or performance builds. Constructed from stainless steel and aluminum alloy, the pieces are finished for corrosion resistance and compatibility with AN4 fittings. Some vehicle variations exist; confirm fitment with your installer before buying.

What problems does this kit solve when installing an LS engine?

The kit organizes fuel and brake line routing while adding a coolant crossover and steam vent path that helps prevent trapped air in the cooling system. It reduces the number of custom-fabricated parts you need, saving time and helping achieve cleaner engine-bay plumbing. Designed for performance or restoration projects, it supports AN4 connections common in aftermarket setups.

• Provides pre-formed lines and fittings for AN4 fuel and brake plumbing.
• Includes a stainless coolant crossover to connect coolant passages across the engine.
• Adds a steam vent to help evacuate air pockets during fill and bleed.
• Minimizes cutting, bending, and custom fabrication at the shop.

How durable and corrosion-resistant are the materials?

Parts are manufactured from stainless steel and aluminum alloy chosen for strength and resistance to rust. That combination balances weight and longevity for under-hood use where heat and fluids are present. Proper installation and use of compatible hoses and fittings will maximize lifecycle performance.

• Stainless-steel components resist oxidation and maintain thread integrity.
• Aluminum alloy pieces reduce weight while resisting corrosion.
• Finished surfaces compatible with AN-style fittings and hoses.
• Recommended for professional fitment to ensure sealing and routing.

Which LS engines and vehicle setups are compatible?

The kit lists broad compatibility with LS1, LS2, LS3, LS6, LS7, LS9 and LSX platforms, but not every application is identical. Differences in accessory drive, intake choice, and chassis clearance can affect fit. Verify with your installer and compare part geometry to your engine and vehicle to ensure correct placement and clearance.

• Intended for popular LS-series engines with AN4 plumbing preferences.
• Some models may require modification—consult installation personnel.
• Works well with common aftermarket intake and accessory configurations.
• Not a guaranteed direct-fit for every chassis; fit check advised.

What should I know about installation and maintenance?

Professional installation is recommended to ensure leak-free connections and proper routing away from heat sources and moving parts. Use appropriate AN4 hoses, torque fittings to spec, and pressure-test fuel and coolant circuits before regular operation. Routine visual checks help detect loosening or wear from vibration and heat cycling.

• Have an experienced technician perform the install for safety and reliability.
• Use correct AN4 hoses, clamps, and sealing practices during assembly.
• Pressure-check fuel and coolant systems before road use.
• Inspect fittings periodically for tightness and corrosion.

Who is this for: Enthusiasts and mechanics completing LS engine swaps, performance builders upgrading fuel or brake plumbing to AN4 standards, and restorers wanting a tidy coolant crossover and steam vent solution. If you prefer off-the-shelf components to reduce fabrication time and want durable stainless/aluminum parts, this kit is aimed at your workflow—just confirm fitment for your specific engine and vehicle combination before purchasing.