New Sierra 18-1971 exhaust riser elbow. Fits many MerCruiser 1972 to 1982 140hp 4-cylinder engines, 1970 to 1981 165hp inline 6-cylinder engines, and 1975 to 1982 GM and Ford V-8 engines with log style (end rise) manifolds. This riser will also fit many 1976 to 1979 MerCruiser 470 applications. Has 3" outlet (measured on O.D. of outlet) and a 90 degrees down-angle. Does not come with gasket or mounting kit. This riser will fit either side of the engine in V8 applications. Each purchase is for one riser.

Riser mating bolt dimensions are 3-1/16" (77.8mm) by 2-13/16" (71.4mm) 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
MerCruiser	76351, 60426, 49964
Osco Motors	6351
Barr Marine	MC-20-76351
Sierra Marine	18-1971
Aqua Power	5701
GLM Products	51120

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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