Harley-Davidson Ultima Base Gasket 4" Rear

This premium cylinder base gasket is engineered to provide a robust, leak-proof seal at the critical junction between the engine case and the cylinder. Manufactured from high-quality materials, it is designed to withstand extreme combustion temperatures and high-pressure environments while maintaining its structural integrity over time. Choosing this Nightforge component ensures a precise fit for a seamless installation, protecting your engine from oil seepage and helping to maintain optimal performance.

This gasket is designed for use with Ultima performance engines and compatible Harley-Davidson Evolution-style Big Twin models.