New Sierra 18-1976-2 marine exhaust riser. Fits many MerCruiser GM/Chevrolet V6, V8, and Big Block applications from 1983 to 2002, where a 4-inch outlet cast iron riser is used (measured on the I.D. of the hose). Models 175, 185, 200, 205, 230, and 898. Riser has 7° down-angle. This riser is cast iron and does not replace the stainless steel, 3-inch outlet, or dry joint versions. This riser comes with a new gasket, bolts, and all necessary plugs. Accepts all original factory accessories and fittings and will fit either side of the engine (port or starboard). Each purchase is for one riser.

Riser mating bolt dimensions are 3-7/16" (87.3mm) by 3-1/16" (77.8mm) bolt center-to-center. Total height of riser is 6-3/4".

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
MerCruiser	44354, 807914, 807988
Osco Motors	4354
Barr Marine	MC-20-44354
Sierra Marine	18-1976-2, 18-1976-1
Aqua Power	5706
GLM Products	51140

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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