Sierra Manifold Riser Spacer

Sierra 18-1908 MerCruiser V6/V8 3" Manifold Riser Spacer

Size: 3"

For:

MerCruiser GM V6 229 and 262cu.in. (Models: 185 and 205)

GM Small Block V8 305-350cu.in. (Models: 200, 228, 230, 260 and 898)

GM Big Block V8 454cu.in. (Models: 330, 340 and 7.4L)

Use With:

Manifold: 18-1952-1, 18-1953-2, or 18-1957-1

Elbow: 18-1970-1,18-1976-1

Exhaust Elbow Mounting Kit: 18-8554,18-8554, and 18-8556

Exhaust Elbow Gasket: 18-0672, 18-0897, and 18-2849-1

Interchangeable With:

Barr

MC-20-93320A3

MerCruiser

93322

Mallory

9-40530

Osco

3320

Frequently Asked Questions

• 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.