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- Parts breakdown drawing with risers / elbows and installation hardware.
- V8 GM big block has an extra
30% water cooling area this will help reduce temperature in port exit area for longer gasket life.
- New design reduces
turbulence and enhances flow for higher power.
- Mercruiser small block GM/Chevy V8 manifolds click here
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51240
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Item 1A
P/N 51240 OEM 807078A6 Exhaust manifold assembly (cast iron) $319.99
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51245 Aluminum
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Item 1B
P/N 51245 OEM N/A Manifold assembly (aluminum - black) $370.95
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21896
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Item 2A
P/N 21892 OEM 22-41622 Plug (steel) $4.95
Item 2B
P/N 21896 OEM N/A Plug (brass) $4.95
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33760
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Item 3
P/N 33760 OEM 27-46820 Gasket (2 units) $23.95
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13990 Plug Kit 22-806926A1
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Item 4
P/N 13990 OEM 22-806926A1 Hose Fitting with Drain Plug Kit. Contents Ref. 8,9,10 $6.95
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30240
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Item 5A
P/N 30240 OEM 27-863724 Gasket (Raw Water Cooling) (2 units) $9.95
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Item 5B
P/N 30220 OEM 27-860231 Gasket (fresh Water Cooling)(2 units) $19.95
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51110 Riser 98504A3
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Item 11A
P/N 51110 OEM 98504A3 Exhaust Elbow (Iron Casting) 3", 15 Degree $167.95
Item 11B
P/N 51115 OEM N/A Exhaust Elbow (aluminum) 3", 15 Degree $233.15
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51140
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Item 12A
P/N 51140 OEM 807988A2 Riser (Iron Casting) 4", 7 Degree $163.95
Item 12B
P/N 51145 OEM N/A Riser (aluminum) 4", 7 Degree $239.15
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89120
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Item 24
P/N 89120 OEM 32-44348T Exhaust Bellow Upper 4” (fits P/N 51110 or
51115) $40.99
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89130
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Item 26
P/N 89130 OEM 32-14358T Bellow - lower 4” (fits P/N 51140 or P/N 51145) (fits P/N
51110 or 51115) $37.99
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89070 upper 3 Inch Exhaust Bellow
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Item 28
P/N 89070 OEM 70981A3 Upper exhaust bellow 4" (fits P/N 51110 or 51115) $38.99
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89090
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Item 29
P/N 89090 OEM 32-90949T Lower bellow 3" (fits P/N 51110 or 51115) $39.99
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Customers who purchased exhaust manifolds
also looked at:
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Prop Shaft Bearing Part 31-30956
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Propeller shaft carrier bearing 11410 may be replaced when re-installing the carrier if the old part
was damaged during removal. Replaces OEM 31-30956T, Sierra 18-1158.
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87510 Seal Kit 26-33144A2
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Lower unit seal kit 87510 is required when re-assembling the parts in the bottom end. Replaces OEM 26-33144A2,
Sierra 18-2652.
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12120 Impeller kit
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P/N 12120 Alpha One Gen 1 impeller water pump kit, for 1984-1990 models, serial numbers 6854393-OD469858. Replaces OEM and Sierra 18-3320.
$35.99
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21950 Alpha 1 with adhesive hinge pin tool
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P/N 21950K *most popular* Same kit as above, also includes bellows adhesive glue and hinge
pin removal/installation tool $179.99
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12110 years 1970-1990 46-57234A3
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P/N 12110 Mercruiser R MR stern drive water pump kit, for 1970-1983, serial numbers 2663442-6225576.
Replaces Mercury and Sierra 18-3317. $39.99
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21960 Alpha one Gen 2 kit 1991 up 30-803099T1
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P/N 21960 Kit with exhaust, u-joint and shift cable bellows with gimbal bearing and oil seal. Includes
outdrive installation gasket. The gimbal bearing is the new sealed type which is maintenance free. Replaces Mercury part number
30-803099T1 $169.99
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21960 Generation 2 exhaust u-joint
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P/N 21960K *most popular For Generation 2 models only, 1991 and up. Also includes bellows adhesive glue and hinge pin
removal/installation $204.99
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21450 Shift cable 865436A03
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P/N 21450 Complete outdrive lower unit shift cable kit. Includes cable, shift bellow, outdrive installation gasket kit and other parts. Replaces Mercury 865436A03 and Sierra
18-2603. $89.99
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11210 1.50 ratio V8
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P/N 11210 Outdrive upper housing gears and gear sets. Includes pinion bearing P/N 21560. For 1970-1997 models, serial numbers 3106717-0K999999. Replaces Mercury
43-18410A4 and Sierra 18-2201. $444.99
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11500 GM 350-305 5.7L Mercury 76850A2
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P/N 11500 Outdrive engine coupler for GM Chevy 4 cylinder, V6 and V8 1985 and older with a 2 piece rear main seal, will NOT work with 1 piece rear main seal
type. Circular mount only will not work with triangular mount. Replaces Mercury 76850A2 and Sierra 18-2171. $187.99
Compatible with models with a 1 piece rear main seal:
110 serial number 1537370-204403
120 2.5L s/n 6229718
- Up
140 3.0L s/n 6229718 - up
160 s/n 2048022-2770031
165, 6 cylinder s/n 2770032 - up
185 s/n 6330183
- up
190 s/n 1564539 - up
898 s/n 4762210
205 (262 CID) s/n A331455-B527954
225 s/n 539620-2694014
228 s/n 4765100-6218461
230 (5.0L) 6218462-B525981
250 s/n 4768000-4908849
260 s/n 4908850-6218461
260 (5.7L) s/n 6218462-B525981
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Contact us by email for any additional information or technical help omc@sterndrive.info
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