This rear cover gasket is engineered for GM Gen III and Gen IV LS engines and replaces the factory rear cover gasket. It seals the rear engine cover to the block to prevent oil leaks and maintain crankcase integrity, particularly when installing or re-installing the rear cover or rear main seal assembly. The gasket is especially useful during rebuilds, reseals, or maintenance where the rear cover is removed.

Brian Tooley Racing BTR39249 Features:

• Fitment: GM Gen III and Gen IV LS-series engines
• Function: Seals rear cover / rear main seal housing to engine block
• Aluminum and molded rubber construction for durability and leak resistance
• Direct-fit replacement for factory rear cover gasket (replaces GM part 12639249 / 12633578)
• Suitable for stock rebuilds, performance engines, or engine swaps

Brian Tooley Racing BTR39249 Notes:

• Sold individually — purchase one per rear cover installation
• Must be used whenever rear cover is removed to ensure proper seal