Mr. Gasket Inline 6 Chevy Intake Gaskets form an airtight, leak-proof seal and can be trimmed into an infinite number of configurations to modify the intake ports to your exact specifications. Engineered specifically for Inline 6 Chevys and made of a cellulose/nitrile composite, theyre precision die-cut for exact fitment and years of trouble-free service. They ensure optimum torque retention, ideal crush resistance, and excellent sheer strength, sealing with minimal clamp force yet still releasing easily every time. An upgrade from Original Equipment gaskets, theyre ideal for both high-performance and racing use.