Sierra 18-1927 4 Inch Exhaust Riser for Crusader Inboard Engines

The Sierra 18-1927 is a heavy-duty 4-inch exhaust riser extension designed specifically for Crusader inboard marine engines. This critical exhaust system component raises the exhaust elbow above the waterline, preventing water from backing up into the engine and ensuring proper exhaust routing in marine applications.

Engine Compatibility:

• Crusader GM Small Block V8: 283, 305, 307, 327, and 350 cubic inch engines (models 220 and 270)
• Crusader GM Big Block V8: 454 and 502 cubic inch engines (models CH350 and 454XL)
• Fits engines manufactured up to approximately 1991

Product Features:

• Heavy-duty cast iron construction for durability and corrosion resistance
• Factory painted and professionally leak tested before shipment
• 4-inch (101.6mm) offset riser design
• Mounts between exhaust elbows and manifolds

Compatible Components: Use with Sierra manifolds 18-1925, 18-1926, 18-1929, or 18-1933; gasket 18-0305-1; and mounting kit 18-8523. Gaskets and mounting hardware sold separately.

OEM Cross-References: Replaces Crusader 97772, Barr CR-20-97772, Mallory 9-40401, and Osco 7772.