New exhaust riser for OMC V8 1977 to 1990 marine gas engines (GM/Chevrolet 5.0L 305 cu. in. & 5.7L 350 cu. in.) that have log-style/end-rise manifolds. This riser will fit either side of the engine. Does not come with gasket or mounting kit. Each purchase is for one riser.

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	909863, 909218, 982680
Osco Motors	9863
Barr Marine	OMC-20-982680
Sierra Marine	18-1921
Aqua Power	5708
GLM Products	51320

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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