Welcome to Defender Canada! 
Sierra
Sierra Mercruiser Closed Dry Joint Riser Gasket - 18-0720
Item: #1780791 | Part Number: 18-0720$78.13
Description
- Closed dry joint gasket for closed cooling applications
- Seals the exhaust manifold-to-riser connection
- Fits GM V-6 and V-8 engines with dry joint manifolds (2002–newer)
- Replaces Mercruiser part numbers 27-864549A02 and 27-864549A1
Sierra Mercruiser Closed Dry Joint Riser Gasket - 18-0720 Item # 1780791
Description
Features:
- Closed Dry joint gasket
- Applications: Closed cooling -block off gasket
Fits:
- GM V-6 & V-8 engines with dry joint exhaust manifold (2002 & newer)
- 4.3L, 5.0L, 5.7L, 6.2L utilizing the Dry Joint Manifold and Riser
Replaces:
- Mercruiser Stern Drive:
- 27-864549A02
- 27-864549A1