The MOROSO 22016 Oil Restrictors are specifically designed for Chevy Big Block engines (Gen 5 and 6), featuring a .0625" orifice for optimized performance. Made in the United States by the reputable brand Moroso, these oil restrictors are a performance part that can help improve engine function and efficiency. With its high-quality construction and compatibility with Chevy BB engines, the MOROSO 22016 Oil Restrictors are a reliable choice for enhancing your vehicle's performance.