305/5.0L  350/5.7L Small Block Chevy
Manifold kit with 4" risers      
505-1-230                              $495.95      
Manifold kit with 3" risers       
505-1-231                              $495.95     
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
and water inlet fittings with drain plugs.
3-inch riser side view
Manifold to head gasket
Manifold riser gasket
3-inch riser attaching method
Comparison  between 3 and 4 inch risers
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 4" riser
(accepts a 4" exhaust
hose).  This riser is used
on 1987 - 2002 Mercruiser
V6 and V8 engines with
the center riser
manifolds.  
4-inch riser outlet
4-inch riser bellows
3-inch riser diagonal view
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.  
4-inch riser attaching method
The 3" riser is attached
with short studs
(included).  
The 4" riser is attached
with 6" long bolts
(included).
Manifold hose barb
Mercruiser manifold and riser kit w gaskets and bolts
High quality Mercruiser manifold
Manifold made w lost foam casting process
MERCRUISER MANIFOLD KITS
305/5.0L 350/5.7L Chevrolet/GM V8
1983-newer
Replaces 860246A10 860246A15 Manifolds
807988A03 and 98504A3 Risers/Elbows
Includes Gaskets, Bolts and Hose fittings