Sierra MerCruiser 7.4 454 502 Exhaust Manifold & Riser Kit 18-1957-1 18-1957-2 18-1976-2

Sierra MerCruiser 7.4 454 502 Big Block V8 Center Riser Exhaust Manifold & Riser Kit

2x Manifold 18-1957-1 SS to 18-1957-2

Replaces
 • Osco: 9011A
 • GLM: 51240
 • MerCruiser: 89011A8 , 807078T08 , 807078T10 , 89011
 • Barr marine: MC-1-89011

2x Riser Elbow 18-1976-2

Replaces:
 • MerCruiser: 44354A3 & 807914A1 & 807988Q03
 • GLM: 51140
 • Osco: 4354
 • Barr Marine: MC-20-44354
 • Aqua Power: 5706
 • Old Sierra Number: 18-1976-1

Kit Contains:
 • 2x Exhaust Manifold
 • 2x Manifold to Riser/Elbow Gasket
 • 2x Manifold to Head Gasket
 • 2x Drain Elbow Plug
 • 2x 4" Riser Elbow
 • 8x Riser Bolts
 • Various Plugs and Fittings