Keeping your LS engine at the proper operating temperature is critical for performance, reliability, and longevity. The Holley LS3 Replacement Thermostat & Housing is designed to restore dependable coolant flow control in your GXP’s factory LS3.

Manufactured from durable cast aluminum, this thermostat housing is built to withstand the high temperatures and demanding conditions found in both street and performance applications. Its corrosion-resistant construction provides long service life while maintaining an OEM-style fit and finish.

This housing features a 1.5-inch hose outlet for compatibility with standard cooling system hoses and includes a high-quality rubber O-ring seal to ensure a reliable, leak-free seal during installation. Designed as a direct replacement, it bolts into place using the factory mounting locations, making it an excellent solution when replacing a worn, damaged, or leaking thermostat housing.