Sierra 18-1976-2 MerCruiser Marine Exhaust Riser 4″ Elbow V6 V8 44354 807988


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Product Details

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 ReferencePart Number
MerCruiser44354, 807914, 807988
Osco Motors4354
Barr MarineMC-20-44354
Sierra Marine18-1976-2, 18-1976-1
Aqua Power5706
GLM Products51140

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.

Additional information

Product Specifications
Item Weight23 lbs
Part Number18-1976-2
Country of ManufactureTaiwan
WarrantyLimited Lifetime
Manufacturer Part Number18-1976-2
Shipping Dimensions17" x 11" x 7"
Replaces44354, 807914, 807988
FitsMerCruiser V6 and V8 Center-rise
MaterialCast Iron
TypeExhaust Riser/Elbow
Shipping Weight27 lbs