Log Style Manifold for a Mercruiser that fits GM small block V8 Port side, and was used up to 1982.
This manifold uses an Osco # O6351
90° down angle for most sterndrives, and an Osco # 6771
0° down angle for most inboard applications.
They made two manifolds that look very similar but the riser mounting pads are different, the riser pad on this manifold is 3-3/4 x 4 Inches.
Replaces Mercruiser #:B-77234A2, 77234B
Osco # 7234B
GLM # 51237
Sierra # 18-1950-1
Mallory # 9-40503 Barr Manifolds and Risers come with a 3-year limited warranty (PDF)!