Victor Reinz 4918 Cylinder Head Gasket Big Block Chevy 454 Mark V Block Mark IV Heads Right Bank

The Victor Reinz 4918 is a specialty cylinder head gasket engineered for Big Block Chevrolet (BBC) 454 engines. Specifically designed for use when mating a Mark V (Gen V) block — any GM 454 block produced in 1991 or later — with Mark IV (Gen IV) style cylinder heads, including aftermarket and older OEM GM heads. This is a passenger side (right bank) gasket only, sold individually.

Using mismatched Mark IV heads on a Mark V block without the correct conversion gasket can result in coolant passage misalignment, water leaks, and catastrophic engine failure. The Victor Reinz 4918 is the purpose-built solution for this conversion application.

Key Features:

• Nitroseal gasket material provides superior, long-lasting sealing performance
• No re-torquing required after installation
• 4.578 in. bore diameter with a 0.042 in. compressed thickness
• Designed specifically for Mark V block / Mark IV head conversions — passenger side (right bank)
• Trusted by OEM manufacturers and professional technicians worldwide
• Cylinder head bolt replacement is recommended upon installation
• UPC: 725975070116

Victor Reinz, a MAHLE brand, has been a global leader in gasket technology for decades, pioneering innovations including multi-layer steel (MLS) gasket construction. The 4918 reflects that engineering heritage, delivering a reliable, high-performance seal for demanding BBC conversion builds.