Log Style Manifold for a Mercruiser. It will fit a Ford small block V8 302/351 on the Port side, and was used from 1970 to 1977. This manifold uses an Osco # O6351
90° down angle riser for most sterndrives, and an Osco # 6771
0° down angle riser for most inboard applications. This item replaces Mercury Quicksilver # 65604; Osco # 5604; Sierra # 18-1958; Mallory # 9-40502Barr Manifolds and Risers come with a 3-year limited warranty (PDF)!