Mercruiser V8 manifold 4" riser kit 1985-2002

GLM Marine aftermarket manifold and riser kit 4 inch for V8 GM engines years 1983 and up

Updated April 26 2026

For 5.0 – 5.7 liter GM/Chevy 200, 228, 230, 898 and 260 models with 305/350
Kit includes screws, gaskets for manifold installation (GLM 31100 and 30270)
Center rise exhaust manifold and elbow. Not compatible with ‘log style’.
30% more water flow area than OEM version
Mercruiser exploded view outdrive drawings click here
3 Year GLM Marine warranty on V8 Mercruiser exhaust manifold & riser kits

Mercruiser V8 manifold 4" riser kit 1985 - 2002

51230 - 51140 Exhaust manifold kit V8 350 - 305

P/N 51230 – 51140 GLM aftermarket V8 exhaust manifold & riser kit. Replaces OEM numbers 860246 A10 and 98504 A3

$333.95 US

$ 363.89 CDN

Included
P/N 51230 Manifold / 860246 A10
P/N 51140 Riser / elbow assembly / 98504 A3
P/N 31100 Mounting gasket / 27 – 33395
P/N 22381 Steel screws / 10 – 43749 x 4
P/N 30240 Riser gasket / 27 – 863724
P/N 13990 Drain plug with o-ring / 22 – 806926 A1
P/N 21891 Plug 3/4 inch -14 (Steel) OEM number 22 – 41622

Customers who purchased GLM aftermarket Mercruiser manifolds
numbers 51230 and 51140 also looked at the following:

Photo

Description / OEM #

Price (USD)

Price (Canadian)

51230 Mercruiser exhaust V8

P/N 51230 Port or starboard GM/Chevy V8 exhaust manifold assembly with gasket set.

OEM number 860246 Q11

$190.95

$ 363.89

P/N 89120 Upper bellow for 4 inch riser P/N 51140. Does not work with P/N 51110. OEM number 32 - 44348 T

$34.95

$ 48.89

58232

P/N 58232 Complete V8 Mercruiser exhaust manifold & riser kit for port and starboard including gaskets, screws and drain plugs.
For 5.0 and 5.7 liter 350 GM/Chevy motors, center rise style.

Includes
P/N 51230 Assembly / 860246 Q11 x 2
P/N 51140 Elbow (4 inch) / 807988 A2 x 2
P/N 31100 Manifold 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 22381 Stud / 10 – 43749 x 8

$598.95

$ 1,289.89

89130-89120

P/N 89130-89120 Upper bellow and lower bellow set for 4 inch riser.

OEM numbers 32-14358001 and 32-44348T

$59.95

$ 45.89

15201 Chevy V6-V8 Engine water pump

P/N 15201 Circulating water pump for 5.0 liter 305 and 5.7 liter 350 small block motors. Fits both metal composite timing chain cover

850399-1
Features include
Stainless Steel Backing Plate
Stainless Steel
Machined Brass Impeller
Bi-Directional & Balanced
Seal Cup & Spring

$96.95

$127.89

31100-30240 Exhaust manifold gaskets

P/N 30240-31100 Manifold and riser installation gasket set. P/N 30240 x 2 and 31100 x 2 included.