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  • Mercruiser Alpha 1 Gen 2 exhaust manifold

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

Last updated on 9/26/2023

  • 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/drain plug.

Mercruiser and Alpha 1 (1983 – 1989, serial numbers 6330183 – OD469858)

Generation 2 models (1991 and up, serial numbers OD469859 – up)

99746A17

Compatible with:

185 (4bbl.) 229/V6 (1983-84, S/N 6330183-6919655)
175 262/V6 (1987-87, S/N 0B527955-0B773242)
185 (2bbl.) 262/V6 (1985-86, S/N 0A331455-0B527954)
205 262/V6 (1985-86, S/N 0A331455-0B527954)
262 Mag EFI 262/V6 (1996-1997, S/N 0F803800-0K999999)
4.3L 262/V6 (1988-96, S/N 0B773243-0F802999)
4.3L 262/V6 (1998-01, 0L010044 & Up)
4.3L EFI 262/V6 (1998-01, S/N 0L012009 & Up)
4.3L MPI 262/V6 (2001-01, 0M300000 & Up)
4.3LH 262/V6 (1998-01, S/N 0L010044 & Up)
4.3 LX (4bbl.) 262/V6 (1988-96, S/N 0B775130-0F802999)
4.3LX (2bbl.) 262/V6 (1996-01, S/N 0F803800-0K999999)
4.3LXH 262/V6 (1996-97, S/N 0F803814-0K999999)

$218.95

$ 375.89

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 – OD469858) 

Generation 2 models (1991 and up, serial numbers OD469859 – up)

860246A10

Compatible with:

200 305/V8, 230 305/V8 (1985-87, S/N 6899058-0B774444)
228 305/V8 (1983-95, S/N 6218462-0F600999)
230 305/V8 (1985-87, S/N 6899269-0B773739)
230 MIE 305/V8 (1981-87, S/N 5907058-0B788151)
5.0L 305/V8 (1988-95, S/N 0B774445-0F600999)
5.0L  and (EFI) 305/V8 (1998-01, S/N 0L015751 & Up)
5.0L MIE 305/V8 (1988-88, S/N 0B788152-0C396832)
5.0L MPI 305/V8 (2001-01, S/N 0M300000 & Up)
5.0 LX 305/V8 (1988-95, S/N 0B773740-0F600999)
898 305/V8 (1983-84, S/N 6218462-6899057)
260 350/V8 (1983-87, S/N 6218462-0B773304)
260 MIE 350/V8 (1981-87, S/N 5907058-0F024999)
300 350/V8 (1985-86, S/N 6668677-0B430367)
320 EFI 350/V8 (1987-89, S/N 0A543604-0C622418)
350 Mag Alpha 350/V8 (1986-87, S/N 0A635178-0K999999)
350 Mag Alpha EFI 350/V8 (1996-97, S/N 0F800300-0K999999)
350 Mag Bravo MPI 350/V8 (1995-95, S/N 0F415189-0F601999)
350 Mag Bravo MPI 350/V8 (1996-97, S/N 0F602000-0K999999)
350 Mag EFI Ski 350/V8 (1996-97, S/N OF820707-0K999999)
350 Mag MPI 350/V8 (1998-01, S/N 0L010019 & Up)
350 Mag MPI Horizon 350/V8 (2001-01, S/N 0M300000 & Up)
350 Mag Horizon MIE 350/V8 (1999-01, S/N 0L304700 & Up)
350 Mag MPI MIE 350/V8 (1998-01, S/N 0L002008-up)
350 Mag MPI Ski 350/V8 (1995-96, S/N 0F350583-0F799999)
5.7L 350/V8 (1988-97, S/N 6218462-0K999999)
5.7L 350/V8, EFI (1998-01, S/N 0L010037 & Up)
5.7L EFI 350/V8 (1995-97, S/N 0F225560-0K999999)
5.7L MIE 350/V8 (1994-97, S/N 0F025000-0K999999)
5.7L MIE 350/V8 (1998-01, S/N 0L002003 & Up)
5.7L Ski 350/V8 (1985-95, S/N 0A338533-0F775199)
5.7L Ski 350/V8 (1996-01, S/N 0F775200 & Up)
5.7LX 350/V8, Bravo EFI, LX EFI (1996-97, S/N 0F601000-0K999999)
Black Scorpion Ski 350/V8 (1996-01, S/N 0F800000 & Up) 

$190.95

$363.89

P/N 51148 Elbow – dry joint (Iron Casting), for Generation 2 MCM GM 4.3L 262 (2002 and up, S/N 0M615000 – up). Includes gasket.

860246A10

$197.95

$307.89

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.

807988A2

$143.95

$268.89

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.

98504A3

$147.95

$314.89

58222 V6-262 4.3L set 1986-2001
Included

P/N 51220 Cast iron assembly / 99746A17 x 2
P/N 51110 / 98504A3 or 51140 / 807988A2 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 / 22-806608A02 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.

$799.95

$799.95

$1,298.89

$1,433.89

58232 GLM V8 kit 1983-2001

Included are parts listed below

P/N 51110 / 98504A3 or 51140 / 807988A2 Elbow – riser (3 inch or 4 inch) x 2
P/N 51230 Cast iron manifold assembly / 860246Q11 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 / 22-806608A02 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

$633.95

$633.95

$1,438.89

$1,289.89

Gaskets / Spacers

Exhaust manifold spacer

50300 Spacer 93320A14

P/N 50300 3″ spacer for iron casting. Used to raise height for hose fitting. 6 inch also available. 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