Mercruiser GM Big Block Center Rise Exhaust Manifold | Sierra 18-1957-2

Center rise exhaust manifold fits Mercruiser GM 7.4L & 8.2L CID marine engines.

Mercruiser GM Big Block Center Rise Exhaust Manifold | Sierra 18-1957-2

• Mercruiser exhaust manifold
• Direct replacement manifold fits Mercruiser GM V8 454 and 502 cu. in. engines with center riser
• For Mercruiser 330, 340, & 454 Magnum model engines
• Interchangeable between port and starboard side
• Heavy duty cast iron
• Painted black
• Includes all gaskets, short riser studs, drain elbow, and plugs
• Manifold mounting kit P/N 18-8532 – sold separately
• Replaces Mercruiser 89011A8, 807078A2, 807078A4, 807078A6, 807078T09, 807078T10
• Replaces Mallory 9-40506
• Replaces Osco 9011A
• Replaces Sierra 18-1957, 18-1957-1