Sierra 18-1939 Riser 

Replaces: Barr 20-0100; Marine Power 0992-593. Barr; Indmar and Marine Power Ford Small Block V8.302-351cu. in. GM Small Block V8 305-350cuGM Big Block V8 454cu in. NOTE: Replaces OEM part # BARR 20-0100 MARINE POWER 0992-593 Barr For: Barr; Indmar and Marine Power Ford Small Block V8 302-351cu. in. GM Small Block V8 305-350cu. in.; GM Big Block V8 454cu in Use with: Manifold: 18-1997-1; 18-1998-1 or 18-1898 Riser Gasket: 18-2854 open or 18-0476 blocked Mounting kit: 18-4364 blocked or 18-8535 open

Sierra replacement engine parts are designed to meet OEM specifications. Use with 3-1/2" I.D. exhaust hose.

Material: Cast iron

• Ford Small Block V8 302-351 cu. in.
• GM Small Block V8 305-350 cu. in.
• GM Big Block V8 454 cu. in.

Interchangeable with:

• Barr
  • 20-0100
• GLM
  • 56140
• Mallory
  • 9-40113
• Marine Power
  • 0992-593
• Osco
  • 99204