Skip to content

Sierra 18-1957-2 Exhaust Manifold Mercruiser

Original price $247.99 - Original price $247.99
Original price
$247.99
$247.99 - $247.99
Current price $247.99

Sierra 18-1957-2 Manifold Replaces 807078T10

For Most Mercruiser Big Blocks with Center Risers. Fits Either Port or Starboard Sides.

Replaces:

  • Mercury
    • 807078A-6; 807078T10
  • Barr
    • MC-1-89011
  • GLM
    • 51240
  • Mallory
    • 9-40506
  • Marine Power
    • 0991-1000
  • Mercruiser Stern Drive
    • 89011A8; 807078A6; 807078T10; 807078T09; 807078A4; 807078A2
  • Osco
    • 9011
  • Pro Marine
    • 51245

Use With:

  • Exhaust Manifold Gasket 18-0418
  • Mounting Kit 18-8532
  • Exhaust Elbow Gasket 18-0672
  • Exhaust Elbow Gasket 18-0897
  • Manifold Riser Spacer 18-1908
  • Elbow 18-1970-1
  • Elbow 18-1974-1
  • Elbow 18-1976-1
  • Manifold Spacer 18-1985
  • Exhaust Elbow Gasket 18-2849-1
  • Exhaust Elbow Mounting Kit 18-8554
  • Exhaust Elbow Mounting Kit 18-8555

 

 

Fits Engines: Most Mercruiser (GM) V-8 big blocks; either side. Replaces Mercruiser part #89011A8;OSCO9011 etc. Fits either port or starboard side. Comes with manifold and riser gasket and bottom water fitting (with built-in drain). This manifold will replace most Mercruiser GM/Chevy V8 Big Block center rise manifolds. Includes all pipe plugs and mounting gasket. Fits 454 and 7.4 liter18-1957;18-1957-;1;18-1957-2. .Fits either side. 3yr warranty. Use this chart to match other aftermarket part numbers to this part: Osco: 9011 Barr: MC-1-89011 Sierra: 18-1957-1 Aqua Power: 5506 GLM: 51240.Use with: Exhaust Manifold Gasket: 18-0418 Mounting Kit: 18-8532