This water crossover gasket set installs at the coolant crossover ports in Gen III and Gen IV LS engines where the coolant crossover tubes or block-off plates mate to the cylinder heads. The gaskets replace aging or leaking seals to restore coolant-tight integrity and prevent coolant seepage or steam-vent leaks. The set is ideal for rebuilds, head work, or coolant-system maintenance.

BTR51933-4 Features:

• Fitment: GM Gen III and Gen IV LS engines
• Replaces OEM coolant-crossover seals (common factory water-crossover / steam-vent seals)
• Seals coolant passages at head crossover ports to prevent leaks or steam-vent issues
• Sold as a complete set of four gaskets — covers all crossover ports per engine
• Direct-fit design — compatible with stock or aftermarket crossover tubes and original head castings

BTR51933-4 Includes:

• Four water crossover gaskets (one for each coolant-crossover port)

BTR51933-4 Notes:

• One set required per engine to replace all crossover seals
• Recommended whenever coolant crossover tubes are removed, replaced, or during head work to prevent leaks and ensure proper coolant flow and air bleed
• Suitable for stock, modified, or performance LS-engine builds