If your diesel truck's head gaskets are either blown or leaking, replace them with this high-quality Sinister Diesel Duramax head gasket. A heavy-duty stainless steel design ensures the kind of seal and durability necessary to endure high temperatures and compression generated by a turbo diesel engine.This Sinister Diesel Black Diamond Head Gasket directly replaces the OE head gasket in 2001 to 2010 Duramax LB7, LLY, LBZ, and LMM diesel engines. Each one features a 5-layer stainless steel sandwich design, plus an adaptive fluoroelastomer (FKM) coating. That means a heavy-duty seal which prevents gasses and fluids from flowing past. Select either a driver's or passenger's side gasket. Features: Construction - Multi-layer Steel, Product Design - Passenger Side, Grade A .95mm thick, Coated with Adaptive fluoroelastomer (FKM), Kit Includes - (1) Sinister Diesel Black Diamond 20mm Head Gasket