Mercruiser Manifold - Starboard - with Mounting Package by SierraFits most Mercruiser GM Small Blocks with End Risers.Key Features: Starboard Side; Supplied with Mounting Package; Use With: Exhaust Manifold Gasket 18-2949; Hardware Kit [Manifold Bolts] 18-8548; Exhaust Manifold Gasket 18-0872; Elbow 18-1971; Elbow 18-1978; Manifold End Cap Gasket 18-2832; Manifold Cap Gasket (Priced Per Pkg of 2) 18-2832-9; Block Off Plate 18-4008; Manifold End Plate 18-4009; Exhaust Manifold Mounting Kit 18-8520; Exhaust Elbow Mounting Kit 18-8554; Exhaust Elbow Mounting Kit 18-8556; Applications: GM 228 S/N 4765100-6218461; GM 250 S/N 4768860-4908849; GM 255 S/N 4499061-Up; GM 260 S/N 4908850-6218461; Replaces: Mercruiser; 77235A8, 77235A2; Barr; MC-1-77235; GLM; 51238; Mallory; 9-40504; Osco; 7235B; Pro Marine; 51238; Use with: Port Exhaust Manifold 18-1950-1.; Exhaust Manifold Gasket 18-2949.; Mounting Kit 18-8548.;