Cast iron Exhaust Riser For Mercruisers. It comes with the Riser and the mounting bolts. It is used on all Mercruiser Center riser applications (V6 & V8) with a 4" riser. 4 Inch riser refers to the exhaust hose size that fits on the riser itself. Generally any from 1986 to 2002. Note: 1986 was a Transition Year, and some applications had 3" risers.
Barr Cast Iron Manifolds and Risers come with a 3-year limited warranty (PDF)!