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What is the Sierra 18-1908 MerCruiser V6/V8 3" Manifold Riser Spacer used for?
The Sierra 18-1908 is a 3-inch manifold riser spacer designed for specified MerCruiser GM V6 and V8 applications. It is listed for GM V6 229 and 262 cu. in. engines, GM Small Block V8 305-350 cu. in. engines, and GM Big Block V8 454 cu. in. engines within the listed model applications.
Which MerCruiser engines does the Sierra 18-1908 manifold riser spacer fit?
The listed applications include MerCruiser GM V6 229 and 262 cu. in. models 185 and 205; GM Small Block V8 305-350 cu. in. models 200, 228, 230, 260, and 898; and GM Big Block V8 454 cu. in. models 330, 340, and 7.4L.
What size is the Sierra 18-1908 manifold riser spacer?
The Sierra 18-1908 manifold riser spacer has a 3-inch size. This specification can be used to compare the spacer with your existing marine exhaust components before ordering.
What manifolds and elbows can be used with the Sierra 18-1908?
The Sierra 18-1908 is listed for use with manifolds 18-1952-1, 18-1953-2, or 18-1957-1 and elbows 18-1970-1 or 18-1976-1. Confirm your existing components against these listed part numbers before ordering.
What mounting kits and gaskets are listed for use with the Sierra 18-1908?
The listed exhaust elbow mounting kits are 18-8554 and 18-8556, and the listed exhaust elbow gaskets are 18-0672, 18-0897, and 18-2849-1. These are identified as "Use With" components and are not stated to be included with the Sierra 18-1908.
What part numbers is the Sierra 18-1908 manifold riser spacer interchangeable with?
The Sierra 18-1908 is listed as interchangeable with Barr MC-20-93320A3, MerCruiser 93322, Mallory 9-40530, and Osco 3320. Comparing your existing part number with these listed numbers can help verify the correct replacement.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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