To substitute an oil pressure relief cover in place of the cover listed in our GB 246-GB 248B full flow filter kits use: ADD-239, (A), or (B) listed for each kit. Warning: Always use a high pressure filter such as the Fram HP1, Oberg or System 1 or a blow out may occur. We could sell you the much cheaper PH8A, (or equivalent) and reduce the price of our kit, however, we have had many of them blow out the first good cold morning, even with a stock 21mm oil pump. |