Sierra Mercruiser GM Big Block Exhaust Manifold - 18-1957-2

Sierra Mercruiser GM Big Block Exhaust Manifold for MerCruiser 330, 340, and 454 Magnum Big Block V8 marine gas engines

Features:

• Interchangeable between port and starboard side
• Ideally suited for freshwater applications
• Heavy duty cast iron
• Painted black
• Includes all gaskets, short riser studs, drain elbow, and plugs
• Manifold mounting not included

Replaces:

• Barr: MC-1-89011
• GLM: 51240
• HE: 9011
• Mallory: 9-40506
• Marine Power: 0991-1000
• Mercruiser Stern Drive:
  • 807078Q07
  • 807078T08
• Osco: 9011