Sierra 18-1848 marine exhaust manifold for many 1990 and newer OMC and 1993 and newer Volvo Penta 4.3L V6 marine gas engines (GM / Chevrolet V-6). 4.3GS 4.3GL 4.3GI. This manifold will fit either side of the engine and accepts all factory original accessories and fittings. Each purchase is for one manifold. Manifold does not include gaskets (use Sierra 18-2909 gasket for head mating surface and Sierra 18-0943 for riser mating surface).
Riser mating bolt dimensions are 3-7/8″ (98.4mm) by 2-19/32″ (65.9mm) bolt center-to-center.
This part is new and high-quality cast iron construction. To determine if this is the correct replacement for you, look on your current part for casting numbers and match them to the cross reference below:
| Cross Reference | Part Number |
|---|---|
| Volvo Penta | 3857656, 3852338, 3852338-7, 3857678 |
| OMC | 914899 |
| Osco Motors | N/A |
| Barr Marine | OMC-1-3857656 |
| Sierra Marine | 18-1848 |
| Aqua Power | N/A |
| GLM Products | 51480 |
About Sierra
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.
