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Mercruiser V8 Models 330, 340 & 454 Magnum

Inboard & sterndrive units: Center riser direct replacement

Mercruiser V8 Models 330, 340 & 454 Magnum
Part Number Description
MC-1-89011 Direct replacement water cooled exhaust manifold. Replaces MerCruiser part number 89011A8.
MC-20-44354 Direct replacement water cooled center discharge riser. Replaces MerCruiser part number B-44354A3. Accepts 4" I.D. exhaust hose (8-degree angle).
MC-20-98502 Direct replacement water cooled center discharge riser. Replaces MerCruiser part number 98502A2. Accepts 3" I.D. exhaust hose (0-degree angle).
MC-20-98504 Direct replacement water cooled center discharge riser. Replaces MerCruiser part number 98504A3. Accepts 3" I.D. exhaust hose (15-degree angle).
MC-20-44354P Mounting package for MC-20-44354 riser.
MC-20-87918 Direct replacement stainless steel block off plate for use with MerCruiser riser numbers 98502, 98504 and 44354. Requires two (2) gaskets—part number MC47-27-41813.
MC-20-93320A3 Manifold to riser 3" spacer blocks (pair) with fastener and gasket package.
MC-20-93322A3 Manifold to riser 6" spacer blocks (pair) with fastener and gasket package.
MC-20-98504P Mounting package for MC-20-98504 riser (includes gaskets, drain plug, pipe plug, stainless steel restrictor plate and fasteners).
MC-20-99208 Direct replacement stainless steel restrictor plate for use with MerCruiser riser numbers 98502, 98504 and 44354. Requires two (2) gaskets—part number MC47-27-41813.
MC-27-47487 Alternator bracket.
MC-29-47442 Upper thermostat housing.
MC-29-90736 Lower thermostat housing.
MC47-27-41811 Direct replacement restrictor gasket. Replaces MerCruiser part number 27-41811. To be used with MC-20-87918 (two (2) required per plate used).
MC47-27-41813 Direct replacement restrictor gasket. Replaces MerCruiser part number 27-41813.
MC47-27-46820 Direct replacement exhaust manifold to head gasket.
MC47-27-87105 Direct replacement exhaust elbow gasket. Replaces MerCruiser part number 27-87105.
MC-50-87238 Exhaust manifold drain cock.
MC-50-806926 Replacement 3/4" N.P.T. X 1" hose fitting (90-degree) brass drain cock.
Note
Manifold includes all plugs, gaskets and mounting hardware to head. Risers include plugs, gasket and mounting hardware to mount to manifold.

The center riser is a two-piece aluminum manifold/riser ideally suited for replacement use where riser protection is required. The Barr center riser aluminum manifold/riser uses flexible exhaust hose which facilitates connection to existing exhaust lines.

All elbows (cast iron) can swivel inboard or outboard for perfect fit. The Barr center riser aluminum manifold/riser is designed to limit back presure on the engine, resulting in more efficient engine performance. The manifold and riser can be reversed and will fit either side of the engine.

The Barr center riser aluminum manifold/riser is cast of 356 T6 aluminum, well suited for fresh water marine applications. Barr Marine's center riser aluminum manifold/riser come with a one year warranty. However, Barr Marine By EDM does not recommend use of this product in salt water applications and does not warrant this product in salt water due to extreme corrosion.