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Mercruiser V8 manifold 3" riser

200, 228, 230, 898, 260 models. GM Chevy manifold
riser kit for V8 305 - 350 engines

  • SEI upper / lower unit Alpha outdrive
Updated May 9th 2026
  • Center rise exhaust manifold and elbow. Not compatible with ‘log style’.
  • Kit includes studs, and mounting gaskets GLM # 31100 and #30270.
  • 3 inch outlet length at 15 degrees uses bellow P/N 89070
  • For 200, 228, 230, 898 and 260 models with 305/350 small blocks
  • Mercruiser exploded view outdrive drawing click here
  • 3 year warranty from GLM Marine

Mercruiser V8 manifold 3" riser kit GM 1985 - 2002

51230 Exhaust manifold applications, Mercruiser V8 manifold 3" riser kit GM 1985-2002

51230 - 51110 Mercruiser kit OEM 860246 A10 - 98504 A3

P/N 51230 – 51110 Exhaust assembly kit – Replaces 860246 A10 and 98504 A3

$333.95 US

$ 363.89 CDN

Includes
P/N 51230 Manifold / 860246 A10
P/N 22391 Steel studs / 16 – 49545 x 4
P/N 30240 Riser gasket / 27 – 863724
P/N 31100 Mounting gasket / 27 – 33395
P/N 21891 Plug 3/4-14 (Steel) / 22 – 41622
P/N 51110 Riser / elbow assembly / 98504 A3
P/N 13990 Drain plug with o-ring / 22 – 806926 A1

Customers who purchased P/N 51230 - 51110 also looked at:

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Description / OEM #

Price (USD)

Price (Canadian)

15201 Engine water pump, V6 Mercruiser manifold & riser 4"

15201 Chevy V6-V8 Engine water pump

P/N 15201
5.0 liter 305, 5.7 liter 350 small block motor water pump that fits both metal composite timing chain cover.
850399 -1

Features include

Machined Brass Impeller
Bi-Directional & Balanced
Stainless Steel
Seal Cup & Spring
Stainless Steel Backing Plate

$96.95

$127.89

M-58231-Mercruiser-parts-V8-elbow-and-manifold-set

58231

P/N 58231

V8 port and starboard kit

Includes gaskets, screws and drain plugs.

5.0L 305 and 5.7L 350 GM/Chevy motors, center rise style.

Includes
P/N 51230 Assembly / 860246 Q11 x 2
P/N 51110
Elbow (3 inch) x 2
P/N 31100 Gasket / 27 – 33395 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
Flange nut / 11 – 46335 x 8

$598.95

$ 1,438.89

Exhaust manifold, Mercruiser Manifold & Riser 3" Kit V6 GM 1985-2002

89070 Upper bellow

P/N 89070
Upper bellow. 3 inch center mounted riser to 4 inch elbow, or 3 inch to 4 inch y-pipe.

OEM 70981 A3

$32.95

$ 46.89

51230 GM exhaust V8-260 manifold

51230 GM V8 350 - 305

P/N 51230
V8 exhaust assembly with gasket. 860246 A10. Used on either port and starboard side.

OEM 860246 Q11

$190.95

$ 363.89

30240 Center mount gasket, Mercruiser V8 manifold 3" riser kit GM 1985-2002

30240

P/N 30240
Center mount gasket for elbow P/N 51110 and 51140.
OEM 27 – 860233

$4.95

$ 7.89

30240 - 31100 Gasket set

P/N 30240 – 31100 

Installation gasket set. P/N 30240 x 2 and 31100 x 2 included.

$21.95

$ 17.89