omc 3.0 to 4.3 conversion

G

gj309auto

Recruit
Joined
Mar 19, 2007
Messages
2
i have a 1990 sunbird with a omc 3.0 cobra with a bad block, i would like to convert it over to a 4.3, my questions are, must i stay with the omc engine or can i use a 4.3 merc and also are conversion kits available for this application? i would like to hear from someone who is familiar with this conversion to find out if this is a big deal to perform
 
Gary H NC

Gary H NC

Fleet Admiral
Joined
Dec 1, 2005
Messages
8,972
Re: omc 3.0 to 4.3 conversion

Best bet would be to get another 3.0.
You are talking about changing a ton of stuff
and a lot of work,Not to mention the cost!
 
Don S

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: omc 3.0 to 4.3 conversion

No conversion kits, but you would have to change the exhaust tube that goes to the transom shield, new gear ratio in the drive, new motor mounts, etc. Just to get started.
 
Bondo

Bondo

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Staff member
Joined
Apr 17, 2002
Messages
70,525
Re: omc 3.0 to 4.3 conversion

And you'll end up with a Major Investment that will Never Pay-Off..........
 
C

Cptkid570

Ensign
Joined
Oct 18, 2005
Messages
967
Re: omc 3.0 to 4.3 conversion

You can find complete 3.0's on ebay for less than $1000.
 
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