Sierra 18-1921 OMC Marine Exhaust Riser Elbow Cobra V8 3.5″ 909863 909218 982680
By Sierra
PART #18-1921
WARRANTYLimited Lifetime
MADE INUnited States
SHIPPING DIMS13" x 11" x 7"
$148.92 USD
Free Shipping to the Contiguous 48 US States
Out of stock
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Product Description
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 ReferencePart Number
OMC909863, 909218, 982680
Osco Motors9863
Barr MarineOMC-20-982680
Sierra Marine18-1921
Aqua Power5708
GLM Products51320

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.
FitsOMC V8 1977-90
Item Weight17.9 lbs
Made InUnited States
Manufacturer #18-1921
MaterialCast Iron
Part Number18-1921
Replaces909863, 909218, 982680
Shipping Dims13" x 11" x 7"
Shipping Weight21 lbs
TypeExhaust Riser/Elbow
WarrantyLimited Lifetime