Difference in years on GM/OMC engines?

D

ddonham

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Apr 8, 2007
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I have a 1988 Four Winns with a OMC 350 engine. I have to replace the engine and I know that some of the older engines are a little different. I know I probably should put a marine engine back in but I think I have a GM truck engine found cheap. What I need to know is does it need to be near the same year or will an older engine work????
 
Don S

Don S

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Aug 31, 2004
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Re: Difference in years on GM/OMC engines?

You should stick with the same vintage engine if you want all the OMC specific brackets for alternators, linkage, PS pumps, etc. to work.
 
Bondo

Bondo

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Apr 17, 2002
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Re: Difference in years on GM/OMC engines?

Ayuh,.....

The Issue you need to deal with is,......
1986 was the Last year of the 2 piece Rear Main Seals,....
And, 1987 was the 1st year for the 1 piece seals........

IF your 1988 boat has a 1988 or 87 motor,... You need a motor with the 1 piece seal......
The Best way to Tell is Look.......
 
SuperNova

SuperNova

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Mar 16, 2007
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1,455
Re: Difference in years on GM/OMC engines?

I definitely agree with Bond-o. The major issue is the rear main, although even if they are different it doesn't kill the deal; you'll jsut have to get the correct flywhell and coupler. The front accessory mounting holes are all the same. Oh, and the fuel pump mount was eliminated on some blocks.

--
Stan
 
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