New marine exhaust manifold for 1983 to 1995 MerCruiser 2.5L and 3.0L marine gas 4-cylinder engines. Fits models 120 and 140 and accepts a MerCarb MerCruiser carburetor (not a Rochester). Carburetor mounting pattern is 3-11/16" x 2". Manifold is for use with electric choke only. Comes with complete gasket kit, new riser studs, and new end plates (see picture).
Riser mating bolt dimensions are 3-1/16" (77.8mm) by 2-13/16" (71.4mm) bolt center-to-center.
This manifold is new and is cast iron construction. For tips on replacing exhaust manifolds and risers, see my eBay guide
. To determine if this is the correct replacement for you, look on your current manifold for casting numbers and match them to the cross-reference below:
|Cross Reference||Part Number|
|MerCruiser||99798A18, 806867A8, 42673|
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If the part numbers and information above aren't enough to determine fitment, you can contact Sierra's Tech Support Line
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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.
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Frequently Asked Questions
Q: Who manufactures this item?
This item is manufactured by Sierra.
Q. What are the shipping dimensions and weight?
This item ships in a box approximately 26" x 10" x 10" and weighs approximately 55 lbs.
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