Hi Group!im Ready To Button Up The Bottom End On My 383 Stroker.my Question Is ,is There A Plug Under The Rear Main Cap That Has Something To Do With Oil Pressure And Filter Bypass?? A Lingenfelter Book I Looked In Says There Is A Small Soft Plug That Goes In Under The Rear Main Cap And If You Dont Put It In You Will Have Pressure Problems.is This True And Where Does This Plug Go?thanks For Looking!