Skip to main content

OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives

boatparts.ca logo
  • Alpha 1 Gen 2 exhaust manifold

Generation 2 Cooling system replacement parts for
Chevy 4.3 and 5.7 liter 6 and V8 models

Updated May 10 2026

  • Manifold and elbows / risers include gaskets
  • GLM design for 30% increased water flow
  • Replacements for Chevy / GM V6 and V8 models
  • Manufactured by GLM Marine with a 3 year warranty

51220 Mercruiser exhaust port-starboard

Photo

Description / OEM #

Price
(USD)

Price (Canadian)

51220 V6 exhaust manifold center rise
Mercruiser drain plug, Mercruiser exhaust manifold V6 conversion kit 4.3 liter

51220 Generation 2 Manifold 99746A17

13990 Hose fitting drain plug 22-806926A1

P/N 51220 Port or starboard exhaust manifold. GM/Chevy V6, 4.3L. Includes gaskets and plastic hose fitting with drain plug. Mercruiser and Alpha 1 (1983 – 1989, serial numbers 6330183 – OD 469858) Generation 2 models (1991 and up, serial numbers OD 469859 – up) 99746 A17

Compatible with:185 (4bbl.) 229/V6 (1983 – 84, S/N 6330183 – 6919655)
175 262/V6 (1987 – 87, S/N 0B 527955 – 0B 773242)
185 (2bbl.) 262/V6 (1985 – 86, S/N 0A 331455 – 0B 527954)
205 262/V6 (1985 – 86, S/N 0A 331455 – 0B 527954)
262 Mag EFI 262/V6 (1996 – 1997, S/N 0F 803800 – 0K 999999)
4.3L 262/V6 (1988 – 96, S/N 0B 773243 – 0F 802999)
4.3L 262/V6 (1998 – 01, 0L 010044 & Up)
4.3L EFI 262/V6 (1998 – 01, S/N 0L 012009 & Up)
4.3L MPI 262/V6 (2001 – 01, 0M 300000 & Up)
4.3LH 262/V6 (1998 – 01, S/N 0L 010044 & Up)
4.3 LX (4bbl.) 262/V6 (1988 – 96, S/N 0B 775130 – 0F 802999)
4.3LX (2bbl.) 262/V6 (1996-01, S/N 0F 803800 – 0K 999999)
4.3LXH 262/V6 (1996 – 97, S/N 0F 803814 – 0K 999999)

$397.99 US

$556.99 CDN

51230 Exhaust manifold

51230 GM V8

P/N 51230

Port or starboard exhaust manifold. GM 305/350, 5.0L and 5.7L. Gaskets included.

Mercruiser and Alpha 1 Gen 1 (1983 – 1989, serial numbers 6218462 – OD 469858) Generation 2 models (1991 and up, serial numbers OD 469859 – up)

860246 A10

Compatible with:200 305/V8, 230 305/V8 (1985 – 87, S/N 6899058 – 0B 774444)
228 305/V8 (1983 – 95, S/N 6218462 – 0F 600999)
230 305/V8 (1985 – 87, S/N 6899269 – 0B 773739)
230 MIE 305/V8 (1981 – 87, S/N 5907058 – 0B 788151) 5.0L 305/V8 (1988 – 95, S/N 0B 774445 – 0F 600999)

5.0L  and (EFI) 305/V8 (1998 – 01, S/N 0L 015751 & Up)
5.0L MIE 305/V8 (1988 – 88, S/N 0B 788152 – 0C 396832)
5.0L MPI 305/V8 (2001 – 01, S/N 0M 300000 & Up)
5.0 LX 305/V8 (1988 – 95, S/N 0B 773740 – 0F 600999) 898 305/V8 (1983 – 84, S/N 6218462 – 6899057)

260 350/V8 (1983 – 87, S/N 6218462 – 0B 773304) 260 MIE 350/V8 (1981 – 87, S/N 5907058 – 0F 024999)
300 350/V8 (1985 – 86, S/N 6668677 – 0B 430367)
320 EFI 350/V8 (1987 – 89, S/N 0A 543604 – 0C 622418) 350 Mag Alpha 350/V8 (1986 – 87, S/N 0A 635178 – 0K 999999)

350 Mag Alpha EFI 350/V8 (1996 – 97, S/N 0F 800300 – 0K 999999)
350 Mag Bravo MPI 350/V8 (1995 – 95, S/N 0F 415189 – 0F 601999)
350 Mag Bravo MPI 350/V8 (1996 – 97, S/N 0F 602000 – 0K 999999)
350 Mag EFI Ski 350/V8 (1996-97, S/N OF 820707 – OK 999999)
350 Mag MPI 350/V8 (1998 – 01, S/N 0L 010019 & Up)
350 Mag MPI Horizon 350/V8 (2001 – 01, S/N 0M 300000 & Up)
350 Mag Horizon MIE 350/V8 (1999 – 01, S/N 0L 304700 & Up)
350 Mag MPI MIE 350/V8 (1998 – 01, S/N 0L 002008 up)
350 Mag MPI Ski 350/V8 (1995 – 96, S/N 0F 350583 – 0F 799999) 5.7L 350/V8 (1988 – 97, S/N 6218462 – 0K 999999)

5.7L 350/V8, EFI (1998 – 01, S/N 0L 010037 & Up)
5.7L EFI 350/V8 (1995 – 97, S/N 0F 225560 – 0K 999999)
5.7L MIE 350/V8 (1994 – 97, S/N 0F 025000 – 0K 999999)
5.7L MIE 350/V8 (1998-01, S/N 0L 002003 & Up)
5.7L Ski 350/V8 (1985 – 95, S/N 0A 338533 – 0F 775199)
5.7L Ski 350/V8 (1996 – 01, S/N 0F 775200 & Up)
5.7LX 350/V8, Bravo EFI, LX EFI (1996 – 97, S/N 0F 601000 – 0K 999999)
Black Scorpion Ski 350/V8 (1996 – 01, S/N 0F 800000 & Up) 

$371.99 US

$531.99 CDN

P/N 51148 
Elbow – dry joint (Iron Casting), for Generation 2 MCM GM 4.3L 262 (2002 and up, S/N 0M 615000 – up). Includes gasket.

860246 A10

$357.99 US

$499.99 CDN

51140 riser with screws

51140 Riser 4 inch

23381 Bolts zinc plated

P/N 51140 
4 inch, 7 degree port or starboard elbow / riser. Compatible with P/N 51220 or 51230. Gasket included.

807988 A2

$336.99 US

$470.99 CDN

51110 Exhaust Manifold

51110 Elbow 3 inch

P/N 51110
3 inch, 15 degree port or starboard elbow / riser. Compatible with P/N 51220 or 51230. Includes gasket.

98504 A3

$348.99 US

$488.99 CDN

58222 V6-262 4.3L set 1986 – 2001

Included

P/N 51220

  • Cast iron assembly / 99746 A17 x 2
  • P/N 51110 / 98504 A3 or 51140 / 807988 A2 Elbow – riser (3 inch or 4 inch) x 2
  • P/N 32170 Gasket / 27 – 99757 x 2 P/N 30240 Gasket / 27 – 863724 x 2
  • P/N 13991 90 degree hose fitting / 22 – 806926 x 2
  • P/N 13992 Drain plug / 22 – 806608 A02 x 2
  • P/N 80140 O-ring for plug / 25 – 45253 x 2
  • P/N 22391 Stud / 16 – 49545 x 8
  • P/N 21248 Locknut / 11 – 46335 x 8
Mercruiser exhaust manifolds 1986-2001
For Chevy/GM V6 4.3L
(1983 – 0M SN#’s)

P/N 58222

 Complete manifold set – replaces 4 inch elbow sets, 2 piece assemblies.

 

P/N 58221 
Complete kit for GM V6 models 1983 and up with 3 inch risers.

$1072.99 US

$1087.99 US

$1500.99 CDN

$1522.99 CDN

58232 
GLM V8 kit 1983 – 2001

Included are parts listed below

P/N 51110 / 98504A3 or 51140 / 807988 A2 Elbow – riser (3 inch or 4 inch) x 2
P/N 51230 Cast iron manifold assembly / 860246 Q11 x 2
P/N 13991 90 degree hose fitting / 22 – 806926 x 2
P/N 31100 Gasket / 27 – 33395 x 2 P/N 30240 Gasket / 27 – 863724 x 2
P/N 13992 Drain plug / 22 – 806608 A02 x 2
P/N 80140 O-ring for plug / 25 – 45253 x 2 P/N 22391 Stud / 16 – 49545 x 8
P/N 21248 Locknut / 11 – 46335 x 8

GLM exhaust manifold kit 1983-2001
Model 200-320, V8 small block GM 305 / 350 / 377 CID (1983 – 0M S/N’s)

P/N 58231 Complete replacement set with 3-inch elbow

 

P/N 58232 Complete replacement GM/Chevy V8 manifold set with 4 inch riser

$1095.99 US

$1061.99 US

$1534.99 CDN

$1486.99 CDN

Gaskets / Spacers

Exhaust manifold spacer

50300 Spacer 93320 A14

P/N 50300 3″ spacer for iron casting. Used to raise height for hose fitting. 

Compatible with port or starboard side of GM V8 or V6 models.

$115.95

$177.89

Exhaust Manifold

30240 Gasket

P/N 30240 Mounting gasket – center rise

27 – 863724

$4.95

$7.89