MerCruiser V8 330 340 454 MAG Center Rise Exhaust Manifold 

Direct replacement water cooled exhaust manifold.

Replaces MerCruiser 807078A6, Osco 9011, Mallory 9-40506, HGE 9011, Sierra 18-1957 and GLM 51240.

Fits MerCruiser V8 Models 330, 340 and 454 Magnum, inboard and stern drive units (center riser direct replacement).

Barr Marine castings have a thicker interior wall, are painted to match original manufacturer colors and are packed in foam for added protection during shipping and storage. Barr manifolds and exhaust connectors are designed to minimize back pressure, and in many cases more r.p.m.'s are achieved after replacing an OEM manifold with Barr replacement parts.

• Replaces MerCruiser part # 89011A8.
• Includes all plugs, gaskets and mounting hardware to the cylinder head.
• 3 year limited warranty on Barr exhaust manifolds, risers and exhaust connectors (1 year when used for commercial purposes).

Compatible parts:

• MC-20-44354 direct replacement water cooled center discharge riser. Accepts 4" I.D. exhaust hose (8 degree angle).
• MC-20-98502 direct replacement water cooled center discharge riser. Accepts 3" I.D. exhaust hose (0 degree angle).
• MC-20-98504 direct replacement water cooled center discharge riser. Accepts 3" I.D. exhaust hose (15 degree angle).
• 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-20-44354P mounting package for MC-20-44354 riser.
• MC-20-87918 direct replacement stainless steel block off plate for use with MerCruiser riser #'s 98502, 98504 and 44354. Requires (2) gaskets part # MC47-27-41813.
• 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 #'s 98502, 98504 and 44354. Requires (2) gaskets part # MC47-27-41813.
• MC-27-47487 alternator bracket.
• MC-29-47442 upper thermostat housing.
• MC-29-90736 lower thermostat housing.
• MC-50-806926 replacement 3/4" N.P.T. X 1" hose fitting (90 degree)/brass drain cock.
• MC-50-87238 exhaust manifold drain cock.
• MC47-27-41811 direct replacement restrictor gasket. To be used with MC-20-87918 ((2) required per plate used).
• MC47-27-41813 direct replacement restrictor gasket.
• MC47-27-46820 direct replacement exhaust manifold to head gasket.
• MC47-27-87105 direct replacement exhaust elbow gasket.

Manufactured by Barr Marine. Part number MC-1-89011.