rcruiser 4.3 replacement with OMC or Vortec?

Captain44

Recruit
Joined
Jun 25, 2019
Messages
1
After a bad winterizing my engine is no good. I have a 2004 Larson with a Mercruiser 4.3 and a second gen outdrive. I have a chance to get a 1989 4.3 OMC cheap or a 4.3 Vortec also. I just don't know if they are compatible? I have someone that is going to do the work.
 

Bondo

Moderator
Staff member
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Apr 17, 2002
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71,310
Ayuh,.... Welcome Aboard,...... Go with the Vortec motor, it's pretty much identical to yer's,.....

The OMC is several incarnations older, 'n will require adaptations to make work,.....
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
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Jul 23, 2011
Messages
51,383
you need a 1996 or newer 4.3, specifically you need a 2003-2007 long block.

not a single thing except the displacement and cylinder spacing is common between a 1989 4.3 and a 2004. two completely different motors, 5 generations apart.
 
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