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Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

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Old 12-08-2004, 01:36 PM
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Default Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

I know that most 20's were powered with 454 big blocks but mine had the 350 sbc package. I'd like to repower with a merc 377 scorpion but wonder about the scorpion's length of 37 inches. That would be 2 inches longer than a 496 magnum. Can anybody help me out? Right now with with the 350 installed there is about 6 inches between the front of the furthermost pulley and the engine compartment wall behind the back seat. Thanks

Jim
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Old 12-08-2004, 01:49 PM
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Default Re: Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

My engine compartment is 44 inches long from transom to firewall.


Here are the dimensions of the various motors

L/W/H
350 SBC 32/30/22
496 35/33/24
377 Scorp 37/29/20
6.2 mx 32/30/22


I really want to go with a 377 scoprion if possible. Thanks for any help


Jim
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Old 12-08-2004, 04:03 PM
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Default Re: Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

The 377 and the 350 are the same basic block. You can take all your 350 accessories and put them on a 377 if you have to have a 377 and it wont fit. I would build your 350 to a 383 stroker and have more power for a lot less $$ .
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Old 12-08-2004, 04:20 PM
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Default Re: Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

So your saying the difference in length is caused by the way the accessories are mounted on?

I don't really don't want to go that route cause I want MPI. And secondly, I don't want to have to deal with the whole process of building that engine and the frustrations that come with it. Thanks for your response

Jim
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Old 12-08-2004, 04:39 PM
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Default Re: Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

I am spec'ing out my '77 for an 800-900 turbine. Name will be "Smokin". I'll keep you posted.
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Old 12-08-2004, 04:44 PM
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Default Re: Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

Be careful!
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Old 12-09-2004, 08:10 AM
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Default Re: Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

[QUOTE=JGB]So your saying the difference in length is caused by the way the accessories are mounted on?

Yes
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Old 12-09-2004, 08:36 AM
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Default Re: Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

very cool! thanks Dan

Jim Bochis
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Old 12-09-2004, 08:37 AM
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Default Re: Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

Dan could you mount the stock scorpion accessories in different locations then?
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Old 12-09-2004, 01:12 PM
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Default Re: Repowering my '85 Cig 20, Do I have enough space to repower with a merc 377 scorpion?

You will be fine with thestock 377 locations.... What drive are you running? Mine has a volve duo-pro and 350 chevy with sea water pump and all the goodies.
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