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4.3 mercury marine vs standard 4.3

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Old 02-13-2010, 04:34 PM   #1
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4.3 mercury marine vs standard 4.3

i have a boat with a 91 4.3 merc that either has a cracked block or head.
'' the motor fill's up with watet a few minutes after leting it run.

I guess my question is whats the diference between the 2 besids the cam? Would it be safe to re-cam a 4.3 from my v8 s-10 swap it runs strong and just sitting in the shop
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Old 02-13-2010, 06:36 PM   #2
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Re: 4.3 mercury marine vs standard 4.3

I have been told some marine engine turn backwards in rotation than a normal car engine. maybe someone will chime with more marine experience.
Old 02-13-2010, 07:55 PM   #3
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Re: 4.3 mercury marine vs standard 4.3

Bottom ends are slightly different . I know they come stock studded. In 94 and 95 the 4.3L had a HD block which ran a really have casting compared to earlier marine and car blocks.
Old 02-13-2010, 07:57 PM   #4
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Re: 4.3 mercury marine vs standard 4.3

no marine motors are not counter roating. that was a very slim production hickup. you should be able to swap no problem. it might not have the mech fuel pump so elect will be needed. other than that should work. cam isnt going to make that big of a diff if you dont wanna swap them
Old 02-13-2010, 08:21 PM   #5
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Re: 4.3 mercury marine vs standard 4.3

Quote: Originally Posted by jbirce18
no marine motors are not counter roating. that was a very slim production hickup. you should be able to swap no problem. it might not have the mech fuel pump so elect will be needed. other than that should work. cam isnt going to make that big of a diff if you dont wanna swap them

Twin I/O setups have the second motor spinning reverse rotation, to reduce cavation of the impellors. So any boat that came with twin 4.3's (if there were any) would have had one rotating in each direction.

To the OP, you need to change the head gasket to use a truck motor in a boat, unless you're only going to use it in fresh water
Old 02-13-2010, 11:27 PM   #6
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Re: 4.3 mercury marine vs standard 4.3

There were a lot of boats that used two GM 4.3L motors but were labled as Volvo.
Old 02-14-2010, 02:27 AM   #7
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Re: 4.3 mercury marine vs standard 4.3

THANKS FOR ALL THE HELP!!! I figured that there would not be a problum swaping them out. It is a fresh water boat and I now have another project to finish befor this summer

THANKS AGAIN
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