18-1939 Manifold Riser

Replace corroded or freeze damaged exhaust risers right out of the box.

Sierra parts are engineered to meet or exceed the specifications of marine engine manufacturers and have gained the confidence of the marine industry. Each riser is an exact OEM match and is leak tested for quality assurance. Mating surfaces are CNC machined to provide the best possible seal without additional preparation. Precision castings feature uniform wall thickness and are primed and painted to stand up to the marine environment. Look no further than a Sierra riser for a quick out of the box installation.

Key Features

• Meets or exceeds manufacturer specifications
• Machined mating surfaces allow installation without additional preparation
• Each riser features uniform wall thickness and is leak tested for quality assurance
• Pre-painted to stand up to marine environment
• Risers can be used on port or starboard side
• Compatible with the following marine engines

• Ford Small Block V8 302 and 351
• GM Small Block V8 305 and 350
• GM Big Block V8 454

• Required Sierra gasket p/n 18-0476-1 or 18-2854-9 (2 pack)
• Backed by SeaStar Solutions Limited Two-Year Warranty

18-1974-1 Application Guide

The Sierra Engine Parts Selector

In addition to exhaust risers, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see our Engine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.