Sierra 18-1986-1 marine exhaust manifold for 1989 to 1998 OMC and 1994 to date Volvo Penta marine gas V8 engines (GM/Chevrolet 5.0L 305 cu. in. and 5.7L 350 cu. in.) with center-rise exhaust systems. This manifold will fit either side of the engine and accepts all factory original accessories and fittings. Does not come with gaskets or bolts. Each purchase is for one manifold.

Riser mating bolt dimensions are 3-7/8" (98.4mm) by 2-19/32" (65.9mm) bolt center-to-center.

This part is new and high-quality cast iron construction. To determine if this is the correct replacement for you, look on your current part for casting numbers and match them to the cross reference below:

Cross Reference	Part Number
OMC/Volvo Penta	914035, 3852374, 3857723, 3852374-2, 3857579, 3847501
Osco Motors	57579
Barr Marine	OMC-1-914035
Sierra Marine	18-1986-1
HGE	4035
Aqua Power	5516
GLM Products	51430

About Sierra
Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.

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