Product DetailsNew Sierra exhaust manifold and riser kit for MerCruiser V6 marine gas engines (GM/Chevrolet 4.3L 262 cu in). Fits most engines from 1985 to 2002 that use 4-inch outlet cast iron risers. Accepts all factory original accessories. Kit includes 2 manifolds, 2 risers, 2 lower water fittings, and all mounting bolts, plugs, and gaskets. Each purchase is for one engine kit.
- Does not replace “dry joint” exhaust, stainless steel risers, or 3″ OD outlet risers (for 3″ ID hose).
- If you have MerCruiser “one-piece” manifolds (807293, 807294), use the conversion kit instead.
- If you also need 3″ tall riser spacer blocks, look for the Sierra 18-1908 listing.
Shipping Note: Due to the weight of these parts, this kit ships in multiple boxes. When you receive your tracking number, be sure to track it on the carrier’s website and find the “Other Packages in this Shipment” section to track all of the individual boxes. For standard/ground shipments, they may arrive on different days.
This kit is new and high-quality cast iron construction. To determine if this is the correct replacement for you, look on your current parts for casting numbers and match them to the cross reference below:
|Cross Reference||Part Number|
|99745, 99746, 99746A8, 99746A17|
44354, 44354A3, 44354A9, 44354A10, 44354A13
807988, 807988A2, 807988A3, 807914A1
|Osco Motors||Manifold: |
|Barr Marine||Manifold: |
|Sierra Marine||Manifold: |
|Aqua Power||Manifold: |
|GLM Products||Manifold: |
Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.