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
