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4" Mercruiser exhaust riser 7 degree V6-V8 1987-2001

4.3, 5.0 and 5.7 liter GM risers for V6 / V8 exhaust manifolds

Last updated on 11/7/2023
  • Riser for Mercruiser and Alpha One GM / Chevy motors
  • Can be used with exhaust manifold P/N 51230 or P/N 51220, V6 and V8
  • 4 inch outlet length, cast iron with improved casting
  • For 185, 205, 262, 200, 228, 230, 898 and 260 models
  • V6 and V8 4.3, 5.0, 5.7 and 7.4 liter applications
  • Riser has 7 degree angle with 4″ O.D. Years 1987 to 2001
  • Manifold and riser have 3 year warranty from GLM Marine
  • Mercruiser manifold or riser exploded view drawings click here

4" Mercruiser exhaust riser

OMC outdrive repair, OMC parts, SEI sterndrives, Mercruiser outdrives, Johnson water pumps

51140 Mercruiser 4 inch GM Chevy OEM 807988Q03

P/N 51140 4 inch riser / elbow assembly – Replaces Mercury 807988Q03. Includes installation screws and gasket.

 

V6 and V8 4.3, 5.0, 5.7 and 7.4 liter applications
Riser has 7 degree angle with 4″ O.D.
Years 1987 to 2001

$143.95 US

$ 268.89 CDN

Included
P/N 51140 Cast iron elbow / 807988Q03
P/N 22381 Screw / 10-43749 x 4
P/N 30240 Riser gasket / 27-863724
P/N 21892 Steel plug / 22-41622

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Exhaust manifold bellow water hose

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P/N 89120 Upper 4 inch bellow, for elbow P/N 51140.

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51220-51140

P/N 51220-51140 Manifold and riser set for 4.3L V6 models. Can be used on port or starboard.

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51110 Elbow

P/N 51110 Replacement 3″ 15 degree elbow assembly for older models with mounting hardware and gasket.

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50300 Spacer

P/N 50300 3 inch spacer. This raises the height of the elbow if more space is required for installation of hoses and bellows. 93320A14

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36160 Head gasket

P/N 36160 GM 5.0L, 5.7L small block CID 305 350 marine head gasket.

27-75611

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12120 Outdrive water pump impeller kit, Mercruiser exhaust riser 15 degree 3" V6-V8 1981-2002

12120 Water pump

P/N 12120 Outdrive water pump impeller kit with housing. Compatible with MR/Alpha One models 1984 – 1990, serial numbers 6854393-OD469858.

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