Mercruiser 4" riser (accepts a 4" exhaust hose). This riser is used on 1987 - 2002 MerCruiser V6 and V8 engines with the center riser manifolds. |
The 3" riser is attached with short studs (included). The 4" riser is attached with 6" long bolts (included). |
All manifold kits come with cylinder head to exhaust manifold gaskets, exhaust manifold to riser gaskets, exhaust manifold to head bolts or studs exhaust manifold to riser attaching bolts, water inlet fittings with drain plugs. |
Mercruiser 3" riser, (accepts a 3" exhaust hose). This riser is used on 1983 -1995 MerCruiser V6 and V8 engines with the center riser manifolds. |
Mercruiser Engines may come with either a 3" riser or a 4" riser. The size of the riser is determined by the diameter of the hose that connects the riser to the exhaust pipe. A 3" hose or a 4" hose. |
MERCRUISER MANIFOLD KITS V6 Chevrolet/GM 1983-2002 with Wet Joint Replaces 99746A17 99746A8 Manifolds 807988A03 and 98504A3 Risers 1983-1986 185 205 V6 used 3-inch risers 98504A3 1987-2002 175, 205 and 4.3L V6 used 4-risers 807988A3 |
The casting numbers on these manifolds is either 863888-C or 99746-C |