If you currently have an early small block Chevrolet that utilizes a canister style oil filter this is a great way to upgrade to one of our spin on style oil filters. This mounts easily with two 5/16″ bolt holes and has 6 – 3/8″ holes in it for oil to flow through. Using a 1″-12 thread, a System 1 spin on oil filter with no inserts will spin right onto the unit.