Barr MC-1-47737 Port side Exhaust Manifold with Rectangular bolt pattern riser for GM Mercruiser small block. Replaces Mercruiser B-47737A. Fits Mercruiser models: 225, 250, 255, 270, & 280TRS. Includes manifold to head gasket and mounting bolts, endplate gaskets, and raw water cooled riser gaskets.
NOTE: Riser to manifold bolt pattern is "RECTANGULAR" 2-3/4" x 4-1/2". Made in USA, 3-year limited warranty.