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Mercury Racing DOHC LS7

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Old May 12, 2018 | 11:04 AM
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Default Mercury Racing DOHC LS7

Will this motor fit in a C7 ?
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Old May 12, 2018 | 04:11 PM
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fit, yes. run, no.
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Old May 12, 2018 | 05:08 PM
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Old May 12, 2018 | 05:12 PM
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Originally Posted by Higgs Boson
fit, yes. run, no.
Thanks for the glib response, but if it will fit into the engine bay it can be made to run.
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Old May 12, 2018 | 07:35 PM
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Just about anything can be done with enough time and money. The question is why and what are your goals?

Last edited by TorchZ51; May 12, 2018 at 07:35 PM.
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Old May 12, 2018 | 07:44 PM
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Originally Posted by lancelot1
Thanks for the glib response, but if it will fit into the engine bay it can be made to run.
don't forget to keep us updated.
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Old May 13, 2018 | 09:01 AM
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It will likely be able to be fit but first check the rotation of the crank before any other consideration. If this is a marine engine, some of them rotate in the opposite direction of automotive engines. This is usually dual engine configurations to counteract torque but it would not be a good thing to have 7 reverse gears and one forward.
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Old May 13, 2018 | 09:26 AM
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Originally Posted by GS583
It will likely be able to be fit but first check the rotation of the crank before any other consideration. If this is a marine engine, some of them rotate in the opposite direction of automotive engines. This is usually dual engine configurations to counteract torque but it would not be a good thing to have 7 reverse gears and one forward.
marine engs turn the same way as cars,,its the outdrive that turns opposite

the MM ls7 started out as a head package for the ls7 eng,then turned into the whole eng deal ,at SEMA merc had 3-4 running vehicles with this eng in it

rumors are this is the DOHC eng in the new c8,
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Old May 13, 2018 | 10:36 PM
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Default Right or left hand crank?

Marine engines are build as as right hand crank rotation or left hand crank rotation. This is a very important matter in consideration Marine engines make high amounts of power but your goals on the track or street are different than marine duty.
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Old May 13, 2018 | 10:44 PM
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Default Merc Marine engine.

If memory serves me correctly Corvette had problems with the total height of this engine application. They were directed to Mercury Racing as they had solved this clearance issue for the offshore racing market.
Originally Posted by dmaxx3500
marine engs turn the same way as cars,,its the outdrive that turns opposite

the MM ls7 started out as a head package for the ls7 eng,then turned into the whole eng deal ,at SEMA merc had 3-4 running vehicles with this eng in it

rumors are this is the DOHC eng in the new c8,
Reply
Old May 13, 2018 | 10:55 PM
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Originally Posted by Del the Grand Sport
Marine engines are build as as right hand crank rotation or left hand crank rotation. This is a very important matter in consideration Marine engines make high amounts of power but your goals on the track or street are different than marine duty.
Many years ago I worked in a small Chevy dealership in the parts dept. I recalled seeing marine application engine parts in some of the catalogs. I asked one of the older mechanics that had been in the business for some time and he related about the availability of reverse rotation motors for marine use. I was beginning to think I had dreamt this. Thanks for confirmation. I'm old, but I didn't think I was that far gone.
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Old May 17, 2018 | 03:10 PM
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Originally Posted by GS583
It will likely be able to be fit but first check the rotation of the crank before any other consideration. If this is a marine engine, some of them rotate in the opposite direction of automotive engines. This is usually dual engine configurations to counteract torque but it would not be a good thing to have 7 reverse gears and one forward.
In a modern day dual engine application the engines all rotate the same direction, the outdrives determine which way the prop rotates.
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