The Fel-Pro SB Chevy Rear Main Seal 59-85 Silicone 2-Piece is a high-quality replacement seal designed for small block Chevy and GM 6-cylinder engines manufactured between 1959 and 1985. Constructed from premium silicone, this two-piece rear main seal offers superior heat resistance and durability, ensuring a reliable seal to prevent oil leaks. Its design facilitates easy installation, making it a preferred choice for both professional mechanics and DIY enthusiasts. This seal is compatible with a range of small block Chevy engines, including the 350 model, and is sold individually.