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Mercruiser manifolds & risers *4 Cylinder *V6-V8 engine

Last updated on 6/2/2024, 7:39:06 AM GLM Marine aftermarket exhaust manifolds and risers units are made by " Lost Foam " manifold technology for precise specification and casting quality. Manifolds have hot dipped galvanized coating black painted for corrosion resistance. GLM engine parts with fully tuned manifold design to reduce back pressure and enhance flow to add increase engine horse power. Fully tuned V8 exhaust manifold design allows the manifolds exhaust system to add 30 - 40% more water cooling area for longer life. In the 4" elbow, there are two extra exits at each side to increase water flushing to avoid engine over heating. In GM small block V8 5.0L and the 5.7L, fully tuned manifold design will guide exhaust gases directly to elbow without turbulence and manifold back pressure. In the meantime, additional 40% water cooling area will decrease the entire manifold body temperature significantly. In GM big block V8 manifold there is an extra 30% water cooling area that will help reduce temperature in port exit area for longer gasket life. The tuned design will reduce turbulence and enhance exhaust riser flow for higher and maximum marine engine power. See our GLM Marine aftermarket Mercruiser / Alpha One manifold application and compatibility chart to find the right parts for your engine or see Marine engine parts for center riser exhaust manifolds.

51210 120-140 hp GM 153 181 4 cylinder years 1982-1995 51210 Mercruiser exhaust manifold	Item number 51210 GLM aftermarket Mercruiser parts 806867A8 GM 120 / 140 hp. 8 Cylinder exhaust manifolds 153 / 181 CID years 1982 - 1995 Item number 51210 Exhaust system OEM number 806867A8 GM 120 / 140 hp. 4 Cylinder manifold 153 / 181 CID years 1982 - 1995 GLM Marine aftermarket parts if required: P/N 51210 GLM Marine exhaust manifold 806867A8 P/N 33570 manifold Gasket 27-96429 P/N 30920 manifold Gasket-End cap (5) 27- 807218 P/N 31520 manifold Gasket-elbow or adaptor 27- 99777- 2 P/N 51020 End cap 805629A1 P/N 51030 End cap 73813A1 P/N 13980 Straight Fitting Water Drain Contents 22-862557 P/N 13992 Drain Plug Kit (5) 22-806608A1 P/N 80140 O-Ring (5) 25-45253 P/N 22443 Screw-End Cap (8) 21-824941 P/N 32180 Gasket-Carburetor Base 27-807982 P/N 22444 Screw Edit 10-807212 P/N 22445 Screw (2) 10-66863-1 P/N 22484 Stud (2) 16-56826 P/N 21892 Plug-Exhaust Elbow 22-41622 P/N 21248 Flange Serrated Nut (5) 11-46335 P/N 22482 Stud-Carburetor (2) 16-70236 P/N 21664 Washer- Carburetor (5) 12-20084 P/N 19354 Lock Nut Carburetor (5) 11-25594 P/N 51160 GLM Marine exhaust elbow assembly 12076A2 P/N 89120 Bellow-4" 32-44348T P/N 01100 Clamp-Bellow 4" 54-815504372 P/N Exhaust Elbow Assembly 76325A2 P/N 22446 Screw-(2) 10-72094 P/N 22447 Screw-(2) 10-34354 P/N 21893 Plug 22-32802-2 P/N 21887 Plug 22-36382 P/N 13984 Straight Fitting 3/4-14 X1 22-807155
Mercruiser 4 cylinder manifold 1968-1982	P/N 51212 Manifold set OEM number 96705A1 $308.00 Model 140 - in-line 4 Years 1968 to 1982 $569.99 GLM Marine aftermarket Mercruiser parts you may need: P/N 51212 Exhaust manifold OEM number 96705A1 P/N 33570 GLM Marine exhaust gaskets 27- 53354 P/N 33570 gaskets 27- 53354 P/N 30920 Gasket-End cap (5) 27- 807218 P/N 31520 GLM marine exhaust Gasket-to elbow (2) 27- 99777-2 P/N 31490 Gasket end cap (5) 27-48043-1 P/N 31660 Exhaust Gasket carburetor base 27-64692 P/N 51030 End cap-contents Ref. 3 73813A1 P/N 22448 Screw-End cap (2) 10-25299 P/N 51010 End cap 60252A2 P/N 22449 Screw-End cap (6) 10-35386 P/N 22482 Stud-Carburetor (2) 16-70236 P/N 21664 Washer-Carburetor (5) 12-20084 P/N 51120 GLM Marine exhaust elbow riser assembly 3" 90 degree angle 76351A2 P/N 51190 GLM Marine exhaust elbow riser assembly 3" with 0 degree angle 76771A2
51214	P/N 51214 Manifold assembly 3.0 Liter / 3.0 L.X. with in-line 4 and GM 181 CID 4 cylinder OEM number 806867A12 $488.99 GLM Marine aftermarket Mercruiser parts that may be required: P/N 33580 Exhaust gaskets 27-815528 P/N 30920 Exhaust Gasket-End Cap 27-807218 *5 P/N 31520 Exhaust Gasket to Elbow 27-99777-2 *2 P/N 51020 End Cap 805629A1 P/N 51030 End Cap 73813A1 P/N 13980 Straight-Water Draining Contents 22-862557 P/N 13992 Drain Plug Kit 22-806608A1 P/N 80140 O-Ring 25-45253 *5 P/N 22443 Screw-End Cap 10-824941 *8 P/N 32180 Gasket-Carburetor Base 27-807982 P/N 21745 Screw 10-53728 *2 P/N 22475 Stud 16-806300 *3 P/N 13984 Straight Fitting 3/4-14 X 1 (Brass) 22-807155 P/N 21248 Flange Serrated Nut 11-46335 *5 P/N 51160 Exhaust Elbow Assembly 12076A2 P/N 22482 Stud-Carburetor 16-70236 *2 P/N 21664 Washer-Carburetor 12-20084 *5 P/N 19354 Locknut-Carburetor 11-25594 *5 P/N 22445 Screw 10-66863-1 *2 P/N 89120 Exhaust Bellow-Exhaust Elbow 4" 32-44348T P/N 01100 Clamp-Bellow 4" 54-815504372 P/N 21887 Plug 22-36382
51220 Manifold 51140 exhaust elbow 4 inch center riser	P/N 51220 Exhaust manifold breakdown drawing for the Chevy 4.3L V6 marine engine. Center riser - cast iron OEM number 99746A17 GM V6 229/262 CID 1983 and up for 3 inch 15 degree and 4 inch 7 degree elbows $299.99 Exploded view GLM Marine aftermarket Mercruiser parts that may be required: P/N 51225 assembly Aluminum black P/N 21892 22-41622 Plug Steel P/N 21896 22- 42861- 1 Plug Brass *2 P/N 32170 27- 99757 Gasket *2 units P/N 13990 22-806926A1 Hose fitting with drain plug kit P/N 30240 27-863724 Gasket - raw water cooling *2 P/N 30220 27-860231 Gasket - fresh water cooling *2 P/N 32080 27-863726 Gasket P/N 13991 22-86221A01 90 degree hose fitting P/N 13992 22-806608A1 Drain plug kit contents P/N 80140 25-45253 O-Ring *5 P/N 51110 98504A3 Exhaust elbow cast iron casting 3" P/N 51115 Exhaust elbow Aluminum casting 3" 15 degree P/N 51140 807988A2 Exhaust elbow cast iron casting 4" P/N 51145 Exhaust elbow Aluminum black 4" 7 degree P/N 51146 Exhaust elbow Aluminum platinum 4" 7 degree P/N 22391 16-49545 Stud Steel *4 P/N 22462 Stud stainless steel *4 P/N 50300 8074776A3 Spacer 3" Iron casting P/N 50305 Spacer 3" Aluminum casting P/N 50600 807477A2 Spacer 6" cast iron casting P/N 50605 Spacer 6" Aluminum black P/N 22481 16-97520 Stud 3/8 x 5 use with 3" elbow / 3" spacer P/N 22474 16-11375 Stud 3/8 x 9-1/2 use 4" elbow / 3" spacer P/N 21494 Lock-washer Stainless steel for aluminum P/N 21248 11-46335 Nut flange serrated nut *5 P/N 21246 Nut stainless steel *2 P/N 21898 22-32802-2 Plug
Manifold Gaskets 31100 V8 manifold 1977 and before	Mercruiser models 198-228-898-225-270 GM engine 305 - 327 - 350 (1977 and before) V8 Exhaust for GM small block 5.0L / 5.7L marine engines GLM Marine aftermarket Mercruiser parts that may be required: Exploded view manifold and riser parts in drawing P/N 51233 (port side) 47737A10 Discontinued P/N 51234 (starboard side) 47738A10 Discontinued P/N 31100 Gasket (2) 27-33395 P/N 31490 End cap gasket (5) 27-48043-1 P/N 31480 Gasket (2) 27-48042 P/N 51010 End cap 60252A2 P/N 51196 exhaust elbow72963A9 P/N 51194 exhaust elbow 76668A3
51264 port 51266 starboard	Models 325 / 330 / 350 and 400 for GM engines 427 / 454 / 482 cubic inch V8 years 1968 to 1986. P/N 51264 Port side and P/N 51266 starboard side. GLM Marine aftermarket parts: P/N 51264 Port side OEM number 47735A17 P/N 51266 Starboard side OEM number 47736A17 P/N 33760 27-46820 Gasket *2 P/N 31490 27-48043-1 Gasket end cap *5 P/N 31480 27-48042 Gasket exhaust elbow *2 P/N 51010 60252A2 End cap P/N 51030 73813A1 End cap P/N 22449 10-35386 Mercruiser screws 8 units P/N 51196 72963A9 Exhaust elbow Not available yet P/N 51194 76668A3 Exhaust elbow Not available yet P/N 22391 Stud OEM number 16-49545 with 4 units P/N 21248 11-49838 Flange serrated nut *5
51224 manifold, 51120 elbow and 51130 elbow	Models: 165 / 200 years 1969 to 1981 with In-line 6 cylinder GM motors GLM Marine aftermarket Mercruiser parts that may be required: P/N 51224 58759A14 in-line 6 cylinder P/N 31440 27-46401 exhaust Gasket P/N 30920 27-807218 exhaust Gasket-End cap (5) P/N 31520 27-99777- 2 (2) P/N 31490 27-48043-1 exhaust Gasket-End cap P/N 30510 27-58764 Gasket-carburetor P/N 51030 73813A1 End cap contents P/N 22448 10-25299 Screw-end cap $4.89 P/N 51010 60252A2 End cap P/N 21746 10-37562 Screw P/N 51190 76771A2 Exhaust elbow assembly 3" 0 degree angle P/N 51120 76351A2 Exhaust elbow assembly 3" 90 degree angle P/N 51130 76325A2 Exhaust elbow assembly 3" 0 degree angle P/N 22391 16-49545 Stud (4) P/N 21248 11-49838 Nut (5)
Manifold risers drawing GM 305-350 V8 1983 present	Mercruiser models 200 / 320 years 1983 and up. 5.0l or 5.7l small block V8 GM 305 / 350 / 377 CID engines with Mercruiser serial numbers OM and up) 3 inch or 4 inch exhaust elbow fitting P/N 51230 cast iron 860246A10 $289.99 Exploded view drawing includes: 8 Cylinder Mercruiser Alpha One manifold years 1983 to present P/N 51230 860246A10 iron casting assembly includes item number P/N 21892 22-41622 Plug 3/4-14 steel *2 P/N 21896 Plug 3/4-14 brass P/N 31100 27-33395 exhaust Gasket *2 P/N 13990 22-806926A1 Hose fitting with drain plug kit Contents P/N 30240 27-863724 exhaust Gasket *2 Raw water cooling P/N 30220 27-860231 exhaust Gasket *2 Fresh water cooling P/N 32080 27-863726 exhaust Gasket *2 P/N 13991 22-806926 90 Degree hose fitting P/N 13992 22-806608A1 Drain plug kit *5 Contents Ref.10 P/N 80140 25-45253 O Ring *5 P/N 51110 98504A3 Exhaust elbow *iron casting 3" 15 Degree P/N 51140 807988A2 Exhaust elbow *iron casting 4" 7 Degree P/N 22391 16-49545 Stud *4 - steel P/N 50300 807467A3 Spacer 3" iron casting P/N 50600 807477A2 Spacer 6" iron casting P/N 22474 16-11375 Stud *4 3/8 x 9 1/2 use with 4" elbow P/N 22481 16-97520 Stud *4 3/8 x 5 use with 3" elbow P/N 21493 13-35048 Lock-washer *10 P/N 21248 11-46335 Flange serrated nut *4 P/N 21898 22-32802-2 Plug *2 P/N 22381 10-43749 Screw steel zinc plated P/N 22379 22-73379 Plug *5 P/N 21745 10-53728 Screw *2 P/N 21899 Plug P/N 22355 10-12244 Screw *4
1977-1982	P/N 51237 Engine parts port side manifold OEM number 77234A7 GLM Marine aftermarket Mercruiser parts that may be required: For 198 - 898 V8 small block Mercruiser 5.0L / 5.7L log style with manifold risers mount on end
GM model 330-370	P/N 51240 Manifold riser assembly - cast iron OEM number 8807078A6 GLM Marine aftermarket Mercruiser parts that may be required: 330 - 370, V8 big block and GM 454/502 (1981 and up) $319.99
	GLM Marine aftermarket Mercruiser parts 215 - 888 Ford 302/351 CID 5.0-5.8 liter 1977 and older
51260 port side / 51262 starboard side	GLM aftermarket Mercruiser parts P/N 51260 Port side Mercruiser exhaust manifolds OEM number 807294A3 years (1996 - 2001 P/N 51262 Starboard side exhaust manifolds OEM number 807293A2 P/N 51262 Starboard side manifold OEM number 807293A2
4 cylinder 488 485 470	GLM aftermarket Mercruiser/Alpha One manifolds for 165 / 170 / 3.7 Liter / 180 / 190 / 470 / MCM 485 / 488 in-line 224 CID 4 cylinder engines years 1980 to 1989 Exploded view manifold parts including: P/N 31710 816219A5 Gasket P/N 32460 Gasket Flange P/N 32470 Gasket Flange P/N 22397 10-74727 Mercruiser stainless steel screw P/N 22479 16-78438-5 Stud (3) P/N 21495 13-35048 Mercruiser lock-washer (4) P/N 21248 Flange serrated nut *5 11-46335 90880A2 Exhaust elbow and reservoir assembly P/N 51180 98562A6 Exhaust elbow and reservoir assembly P/N 21748 10-78259 screw (4) P/N 30820 27-71614 Edit Text Gasket filler cap (5) P/N 21897 22-13234A1 Fitting kit filler hole P/N 80290 25-45257 O-ring filler base P/N 13890 36-13130 Cap P/N 13986 22-45084 Hose fitting P/N 13940 22-76170 Elbow fitting P/N 13930 22-99498 $10.89 Edit Text P/N 32100 27-89656-1 Gasket (5) P/N 13590 89659A3 Thermostat housing P/N 13590 15995 temperature sender P/N 21496 13-39107 Lock-washer (2) P/N 23233 10-73657 Screw (2) P/N 13830 15995 temperature sender P/N 21894 22-32803 plug P/N 13040 99155A1 Thermostat P/N 89070 3.7 exhaust bellow
59235 Aluminum manifold set	P/N 59235 51210 Engine parts aluminum manifold kits with risers and mounting hardware $1899.00 - $1999.00 GM V6 and V8 5.7L small block 3 inch or 4 inch hose fittings
51130 Elbow	GLM Marine aftermarket Mercruiser elbow and riser Including: P/N 51130 elbow 120 and 140 hp. Years 1982 to 1985 Mercruiser OEM number 76325A2 P/N 51120 elbow 2.5 liter, 3 liter and V8 years 1981 and before Mercruiser OEM number 76351A2 P/N 51140 elbow 4 inch O.D. V6 and V8 with bolts and plug Mercruiser OEM number 807988A2 P/N 51110 exhaust elbow 3 inch O.D. V6 and V8 with plug
Gaskets	GLM Marine aftermarket Mercruiser parts that may be required: Mercruiser / GM / Ford engines for all GM 4 cylinder, 6 cylinder, V6 and V8 exhaust models Engine parts including manifold mounting gasket P/N 31570 GM 181 3.0L CID Mercruiser OEM number 27-53354 P/N 31101 Chevy 47-0000 Barr Style P/N 31710 224 cubic inch 3.7 liter engine exhaust gasket for models:165, 170, 180, 190 and 470-MCM 485/488 Years 1980 to 1989 27-68715 P/N 31440 Mercruiser OEM number 27-46401 GM 250 cubic inch 4.1 Liter P/N 32170 GM 262 4.3 Liter CID (2) P/N 33580 Mercruiser OEM number 27-815528 GM 181 3.0L X CID P/N 31100 Mercruiser OEM number 27-33395 GM 305 / 350 cubic inch 5.0L and 5.7L Chevy engines (2) P/N 33790 Mounting exhaust Gasket Mercruiser OEM number 27-73866 Ford 302/351 5.0L/5.8L CID (2) P/N 33760 Mounting exhaust Gasket Mercruiser OEM number 27-46820 GM 454 / 502 7.4 and 8.2 liter CID (2) P/N 31550 Mounting exhaust Gasket Mercruiser OEM number 27-52546 GM 153 CID 2.5 liter CID
89090 Lower tube	Lower engine exhaust manifold bellows 3 inch elbow to 3 inch Y-pipe Including: P/N 89090 replaces Mercruiser OEM part number 32-90949T works with model 120/140 years 1982 - 1995 Chevy 305 / 350 / 377 big block 454 / 502 and V6 229 / 262 (1981 up to serial numbers that start with 0M 3 inch diameter part installs between the riser and the Y pipe

Customers who ordered manifold / riser parts also purchased:
90190 Mercruiser tool bearing carrier retainer wrench	P/N 90190 GLM Marine aftermarket Mercruiser Retainer wrench tool removes and installs the cover nut in front of the bearing carrier. Replaces Mercruiser part number OEM 91-61069T, Sierra P.N 18-9858. $112.99
M 12110 Water pumps 1970-1983	P/N 12110 years 1970 to 1983 Mercury / Mercruiser water pumps serial numbers 2763442 - 6854392 $44.99 GLM Marine aftermarket Mercury / Mercruiser 1 / R years 1970 - 1983 Mercruiser serial numbers 2763442 - 6854392 Includes: P/N 89840 / 47-89984T4 Water pumps impellers P/N 11070 / 28-56654 Key P/N 12410 / 46-96148T1 Water pumps housing P/N 12310 / 46-57234T1 Water pumps base P/N 12820 / 23-29804T guide tube P/N 12810 / 48752 Cup P/N 12510 / 32435 Wear plate P/N 31010 / 27-85608-1 Gasket
87510 Seal Kit 26-33144A2	P/N 87510 GLM Marine aftermarket Mercruiser lower gear case seal kit Required when re-assembling the parts in lower unit. Replaces Mercruiser OEM parts number 26-33144A2, Sierra P/N 18-2652.

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