V6 Chevy Manifold kits
V6 Manifold kit with 4" risers
505-1-220                                               $529.95    
V6 Manifold kit with 3" risers               
505-1-221                                               $529.95
Attaching method 3
Manifold to head gasket
Riser gasket restricted
comparison 3 and 4-inch risers
4-inch hose
4-inch bellows
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.  
side view of 3-inch riser
Diagonal view of 3-inch riser
Attaching method 4
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.
water hose inlet barb
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.  
Manifold, risers, gaskets and bolts
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.
Riser gasket open
Lost Foam manufacturing
High quality casting
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