Enhance your engine's performance with the Fel-Pro 400 Chevy Head Gasket. Designed for small block Chevy engines, this head gasket is suitable for both cast iron and aluminum heads. With a precise 4.200-inch bore and a compression thickness of 0.041 inches, it ensures optimal sealing and efficiency. Made with a durable steel core laminate, it's built to withstand the demands of high-performance engines. Ideal for those looking to maintain or upgrade their engine's sealing integrity.