Riser Spacers and Extensions - MerCruiser

Manifold to riser 3" spacer (single block).

Replaces MerCruiser 61851A3.

Fits these applications:

• MerCruiser 4 cylinder 181 C.I.D. 140 H.P., Model 140 engine (log style direct replacement).
• MerCruiser 4 cylinder 153 and 181 C.I.D., 120 H.P. (2.5L) and 140 H.P. (3.0L), Models 120R and 140R-MR/Alpha 1 (log style direct replacement).
• MerCruiser straight 6 cylinder Model 165 (log style 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.

• Includes all mounting hardware, gaskets and drain plug.
• Each spacer block kit includes the spacer block(s) and the corresponding package to mount.

Compatible parts:

• MC-1-52390 direct replacement water cooled exhaust manifold. For serial # 3332138 and up.
• MC-1-58759 direct replacement water cooled manifold to fit the 6 cyl. GM (Model 165) engine.
• MC-1-95862 direct replacement water cooled manifold (Rochester (3 1/4" X 1 7/8") bolt pattern). 6 bolt mounting.
• MC-1-96705 direct replacement water cooled manifold (Rochester (3 1/4" X 1 7/8") bolt pattern). 6 bolt mounting.
• MC-1-99798 direct replacement water cooled manifold (MerCarb (3 11/16" X 2") bolt pattern). 6 bolt mounting.
• MC-20-12076 direct replacement exhaust riser.
• MC-20-60426 direct replacement exhaust elbow riser (utilizes a stainless steel sleeve at the water/air mixing area).
• MC-20-76325 direct replacement exhaust riser.
• MC-20-76351 direct replacement exhaust elbow riser.
• 1-54870 direct replacement exhaust manifold rear end cap. Serial # 4481625 and below.
• 1-54870P rear end cap mounting package.
• 1-60252 direct replacement exhaust manifold end cap/connector.
• 1-60252P front end plate mounting package.
• MC-1-52390P exhaust manifold mounting package.
• MC-1-58759P exhaust manifold mounting package.
• MC-1-58764P manifold to carburetor adaptor mounting package.
• MC-1-99798P exhaust manifold to cylinder head mounting package.
• MC-20-55730 stainless steel fresh water cooling block off plate for use with MerCruiser riser #'s 60426, 76351 and 76771. Requires (2) gaskets part # MC47-27-52076.
• MC-20-60207 stainless steel block off plate (with vent hole) for use with MerCruiser riser #'s 60426, 76351 and 76771. Requires (2) gaskets part # MC47-2752076.
• MC-20-60426P exhaust riser elbow mounting package. For use with both MC-2060426 and MC-20-76351 risers.
• MC-29-47587 direct replacement lower thermostat housing.
• MC-29-60372 direct replacement upper thermostat housing.
• MC47-27-46401 direct replacement manifold to head gasket.
• MC47-27-48043 direct replacement exhaust manifold end cap/connector gasket (will fit both ends).
• MC47-27-52076 direct replacement exhaust elbow to exhaust manifold gasket.
• MC47-27-53354 direct replacement exhaust manifold to cylinder head gasket.
• MC47-27-53354A1 exhaust manifold gasket set.
• MC47-27-73814 direct replacement exhaust manifold end cap gasket. Utilized with 1-73813 rear end cap.
• MC47-27-96429 direct replacement exhaust manifold to cylinder head gasket.
• MC47-27-99777-3 direct replacement exhaust elbow to manifold gasket.

Manufactured by Barr Marine. Part number MC-20-61851A3.

Need to purchase additional block of gaskets for close cooled applications.

Fits MerCruiser V6 and V8 4.3L, 5.0L, 5.7L and 6.2L "dry joint", all carbureted, MPI, inboard, Alpha and Bravo stern drive models (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.

• Replaces MerCruiser #865995A01 Kit includes 1 Pair of Spacers with mounting hardware and gaskets for raw water cooled applications.
• Sold as shown.
• Always use the correct riser gasket for your application and refer to the correct guide to install gaskets correctly. Improperly installed gaskets, leaks or damage caused by either are not covered by the Barr Marine warranty. Gaskets are not subject to exchange or refund under any circumstances.

Compatible parts:

• MC47-27-864547 direct replacement restrictor gasket.
• MC47-27-864850 direct replacement restrictor gasket.

Manufactured by Barr Marine. Part number MC-20-865996A3.

Direct replacement 6 inch spacer kit. Need to purchase additional block off gaskets for closed cooled applications.

Replaces MerCruiser 864908A1.

Fits MerCruiser V6 and V8 4.3L, 5.0L, 5.7L and 6.2L "dry joint", all carbureted, MPI, inboard, Alpha and Bravo stern drive models (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.

• Replaces MerCruiser part # 864908A1.
• Kit includes a pair of spacers, mounting hardware and gaskets for raw water cooled applications.
• Sold as shown.
• Always use the correct riser gasket for your application and refer to the correct guide to install gaskets correctly. Improperly installed gaskets, leaks or damage caused by either are not covered by the Barr Marine warranty. Gaskets are not subject to exchange or refund under any circumstances.

Compatible parts:

• MC-20-864929A3 direct l replacement 3 inch spacer kit. Kit includes a pair of spacers, mounting hardware and gaskets for raw water cooled applications.
• MC-20-864908A1P six inch spacer mounting package. Includes all items less the spacers and brackets.
• MC47-27-864547 direct replacement restrictor gasket.
• MC47-27-864549 direct replacement restrictor gasket. Direct replacement restrictor gasket.
• MC47-27-864850 direct replacement restrictor gasket.

Manufactured by Barr Marine. Part number MC-20-864908A1.

3"spacer kit (with 9" bolts) for a 7 degree dry joint riser (MC-20-864309) sold in pairs. Mounted between exhaust manifold and exhaust riser.

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.

• Used with MerCruiser Dry Joint exhaust applications on 350 MAG, 357 MAG, 383 MAG STROKER, 4.3L, 5.0L, 5.7L, and 6.2L engines that use the 7 degree riser.

Manufactured by Barr Marine. Part number MC-20-864929A1.

Direct l replacement 3 inch spacer kit. Need to purchase additional block off gaskets for closed cooled applications. Note: When using 7 degree low profile riser part # MC-20-864309 a use spacer mounting package MC-20-864929A1

Replaces MerCruiser 864929A3.

Fits MerCruiser V6 and V8 4.3L, 5.0L, 5.7L and 6.2L "dry joint", all carbureted, MPI, inboard, Alpha and Bravo stern drive models (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.

• Replaces MerCruiser part # 864929A 3.
• Kit includes a pair of spacers, mounting hardware and gaskets for raw water cooled applications.
• Sold as shown.
• Always use the correct riser gasket for your application and refer to the correct guide to install gaskets correctly. Improperly installed gaskets, leaks or damage caused by either are not covered by the Barr Marine warranty. Gaskets are not subject to exchange or refund under any circumstances.

Compatible parts:

• MC-20-864908A1 direct replacement 6 inch spacer kit. Kit includes a pair of spacers, mounting hardware and gaskets for raw water cooled applications.
• MC-20-864908A1P six inch spacer mounting package. Includes all items less the spacers and brackets.
• MC47-27-864547 direct replacement restrictor gasket.
• MC47-27-864549 direct replacement restrictor gasket. Direct replacement restrictor gasket.
• MC47-27-864850 direct replacement restrictor gasket.

Manufactured by Barr Marine. Part number MC-20-864929A3.

Manifold to riser 3" spacer blocks (pair) with fastener and gasket package.

Replaces MerCruiser 807476A6, Osco 3320 (single), HGE 3320-PR and GLM 50310.

Fits these applications:

• MerCruiser V6 229 and 262 C.I.D., Models 185R, 185MR, 205R and 205MR (center riser direct replacement).
• MerCruiser V8 Models 898R, 228R and 260R (center riser direct replacement).
• 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.

• Each spacer block kit includes the spacer block(s) and the corresponding package to mount.

Compatible parts:

• MC-1-87114 direct replacement water cooled exhaust manifold.
• MC-1-89011 direct replacement water cooled exhaust manifold.
• MC-1-99746 direct replacement water cooled exhaust manifold.
• 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-20-93322A3 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-27-93175 alternator bracket.
• MC-29-47441 upper thermostat housing.
• MC-29-47442 upper thermostat housing.
• MC-29-87290 lower 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.
• MC47-27-33395 direct replacement exhaust manifold to head gasket.
• 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.
• MC47-27-99757 direct replacement manifold to head gasket.

Manufactured by Barr Marine. Part number MC-20-93320A3.

Manifold to riser 6" spacer blocks (pair) with fastener and gasket package.

Replaces MerCruiser 807477A5, Osco 3322 (single) and Mallory 9-40531.

Fits these applications:

• MerCruiser V6 229 and 262 C.I.D., Models 185R, 185MR, 205R and 205MR (center riser direct replacement).
• MerCruiser V8 Models 898R, 228R and 260R (center riser direct replacement).
• 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.

• Each spacer block kit includes the spacer block(s) and the corresponding package to mount.

Compatible parts:

• MC-1-87114 direct replacement water cooled exhaust manifold.
• MC-1-89011 direct replacement water cooled exhaust manifold.
• MC-1-99746 direct replacement water cooled exhaust manifold.
• 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-20-44354P 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-27-93175 alternator bracket.
• MC-29-47441 upper thermostat housing.
• MC-29-47442 upper thermostat housing.
• MC-29-87290 lower 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.
• MC47-27-33395 direct replacement exhaust manifold to head gasket.
• 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.
• MC47-27-99757 direct replacement manifold to head gasket.

Manufactured by Barr Marine. Part number MC-20-93322A3.

Manifold to riser 3" spacers (sold in pairs).

Fits these applications:

• MerCruiser V8 225, 250, 255, 270 and 280, inboard and stern drive units (log style direct replacement).
• MerCruiser V8 325, 330, 350, 370 and 400, inboard and stern drive units (log style 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.

• Includes all mounting hardware, gaskets and drain plugs.
• Each spacer block kit includes the spacer block(s) and the corresponding package to mount.

Compatible parts:

• MC-1-47735 direct replacement water cooled exhaust manifold (port side).
• MC-1-47736 direct replacement water cooled exhaust manifold (starboard side).
• MC-1-47737 direct replacement water cooled exhaust manifold (port side).
• MC-1-47738 direct replacement water cooled exhaust manifold (starboard side).
• MC-20-72963 direct replacement exhaust elbow riser.
• MC-20-76668 direct replacement exhaust elbow riser.
• 1-60252 direct replacement exhaust manifold end cap/connector.
• 1-60252P front end plate mounting package.
• MC-1-77234P manifold mounting package.
• MC-20-72963P exhaust riser elbow mounting package.
• MC-20-76668P exhaust riser elbow mounting package.
• MC-27-47487 alternator bracket.
• MC-29-47441 upper thermostat housing.
• MC-29-78984 lower thermostat housing.
• MC-29-78985 lower thermostat housing.
• MC47-27-33395 direct replacement exhaust manifold to head gasket.
• MC47-27-33395A2 exhaust manifold gasket set.
• MC47-27-46820 direct replacement exhaust manifold to head gasket.
• MC47-27-48042 direct replacement exhaust elbow to manifold gasket.
• MC47-27-48043 direct replacement exhaust manifold end cap/connector gasket (will fit both ends).
• MC47-488 KIT thermostat kit (includes gasket and thermostat).

Manufactured by Barr Marine. Part number MC-20-61811A4.

Manifold to riser 3" spacers (sold in pairs).

Replaces MerCruiser 61851A2, Osco 1851 (single), Mallory 9-40532 and GLM 50330.

Fits these applications:

• MerCruiser V8 198, 228, 255, 260 and 898, inboard and stern drive units (log style direct replacement).
• MerCruiser V8 (Ford) 302 and 351 C.I.D., Models 188, 215, 225, 233, 255 and 888 inboard and I/O units (log style 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.

• Includes all mounting hardware, gaskets and drain plugs.
• Each spacer block kit includes the spacer block(s) and the corresponding package to mount.

Compatible parts:

• MC-1-65603 direct replacement water cooled exhaust manifold (starboard side).
• MC-1-65604 direct replacement water cooled exhaust manifold (port side).
• MC-1-77234 direct replacement water cooled exhaust manifold (port side).
• MC-1-77235 direct replacement water cooled exhaust manifold (starboard side).
• MC-20-60426 direct replacement exhaust elbow riser (utilizes a stainless steel sleeve at the water/air mixing area).
• MC-20-76351 direct replacement exhaust elbow riser.
• MC-20-76771 direct replacement exhaust elbow riser.
• 1-60252 direct replacement exhaust manifold end cap/connector.
• 1-60252P front end plate mounting package.
• MC-1-6560P manifold mounting package.
• MC-1-77234P manifold mounting package.
• MC-20-55730 stainless steel fresh water cooling block off plate for use with MerCruiser riser #'s 60426, 76351 and 76771. Requires (2) gaskets part # MC47-27-52076.
• MC-20-60207 stainless steel block off plate (with vent hole) for use with MerCruiser riser #'s 60426, 76351 and 76771. Requires (2) gaskets part # MC47-2752076.
• MC-20-60426P exhaust riser elbow mounting package. For use with both MC-2060426 and MC-20-76351 risers.
• MC-27-48104 alternator mounting bracket.
• MC-29-47441 upper thermostat housing.
• MC-29-62898 upper thermostat housing.
• MC-29-63588 lower thermostat housing.
• MC-29-78984 lower thermostat housing.
• MC47-27-33395 direct replacement exhaust manifold to head gasket.
• MC47-27-33395A2 exhaust manifold gasket set.
• MC47-27-48043 direct replacement exhaust manifold end cap/connector gasket (will fit both ends).
• MC47-27-73866 direct replacement exhaust manifold to head gasket.
• MC47-27-99777-3 direct replacement exhaust elbow to manifold gasket.
• MC47-488 KIT thermostat kit (includes gasket and thermostat).

Manufactured by Barr Marine. Part number MC-20-61851A2.