18-1939 Manifold Riser
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SIERRA18-1939 Manifold Riser


In stock online.
Model # 5328646 | Mfg # 18-1939UPC # 808282127428
18-1939 Manifold Riser


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18-1939 Manifold Riser

Name Value
Compatibility Ford Small Block V8 302 and 351, GM Small Block V8 305 and 350 and GM Big Block V8 454 Marine Engines
Material Cast Iron
Type Risers

Product Overview

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

18-1974-1 Application Guide

ApplicationOEM Part Numbers
Marine Power0992-593

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.


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