DescriptionNew 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 riser is new, high-quality cast iron construction, and is made in the USA. For tips on replacing exhaust manifolds and risers, see my eBay guide. To determine if this is the correct replacement for you, look on your current riser for casting numbers and match them to the cross-reference below:
|Cross Reference||Part Number|
|OMC||909863, 909218, 982680|
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.