Exhaust Riser for Indmar with a 3 inch exhaust outlet. Used on GM small block (305-350) and Ford small blocks (302/351) using Barr and Indmar Style manifolds.
It has a 3.0" exhaust outlet with a 30° down angle. The Riser Is Tapped for Fresh Water Cooled Applications or is Plugged for Raw Water Applications.
Riser Mounting Pad is 3-5/8 x 5-5/8 with mounting bolt centers 2-5/8 x 4 Inches
Includes: Plug, Raw Water cooling gasket and mounting hardware to mount to manifold.
Osco # 2018
Indmar #s: 53-2009, 53-2018
Sierra # 18-1907
GLM # 56120
Mallory # 9-40112
This is NOT a Mercruiser or PCM style replacement exhaust.