Sierra Exhaust Manifold - 18-1903 for OMC Stern Drive, Replaces 912442

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Mfg 18-1903, iboats IB00058499, UPC 030999620910

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Key Features:

  • GM Small Block (V8) 305-350 cu. in. (1979-1989) (Port)

Additional Details:

  • For: Port Side

Use With:

  • 18-1921: Manifold Elbow/18-2949: Exhaust Manifold Gasket/18-8502: Exhaust Manifold Mounting Kit/18-2902-1: Exhaust Manifold Gasket/18-2902-1-9: Exhaust Manifold Gasket (Priced Per Pkg of 2)

Cross References

  • Osco 2442
  • GLM 51420
  • OMC Stern Drive 912442
  • Mallory 9-40601
  • Barr OMC-1-912442

Fitment Information


  • 5.7 liter 1987-1988 4 stroke 5.7 liters 8 cylinders
  • 5 liter 1987-1988 4 stroke 5 liters 8 cylinders
This product fits:

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