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Is the 5.7gm engine still made brand new? #5194979 08/23/19 08:19 PM
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motor_oil_madman Offline OP
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I'm looking at doing a total repower on my boat and I've always been cautious about remanufactured engines cause some engine builders take short cuts or use marginal parts.

I was thinking of having my vortec 5.7 carbed engine turned into a 383 stroker and just using a reputable shop here in Houston.

Last edited by motor_oil_madman; 08/23/19 08:21 PM.

2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5194981 08/23/19 08:23 PM
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Yes, you can buy a brand new L31 from your local Chevy dealer for about $2k.

Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5194984 08/23/19 08:26 PM
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rrwildlife Offline
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https://www.ebay.com/itm/GM-OEM-NEW-CRATE-Engine-350-12530283-Chevrolet-5-7-L31R-DEALER-DIRECT-12681431/301567296304?hash=item4636cfc330:g:uxgAAOSwTC1dUc2L

I purchased one of the L31’s from Radley Chevrolet to upgrade a 83 Silverado to fuel injection. Fast shipping, the price was right, and the transaction was handled professionally


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Re: Is the 5.7gm engine still made brand new? [Re: rrwildlife] #5194987 08/23/19 08:36 PM
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cpayne5 Offline
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Originally Posted by rrwildlife
https://www.gmperformancemotor.com/parts/12703983.html

https://www.ebay.com/itm/GM-OEM-NEW-CRATE-Engine-350-12530283-Chevrolet-5-7-L31R-DEALER-DIRECT-12681431/301567296304?hash=item4636cfc330:g:uxgAAOSwTC1dUc2L

I purchased one of the L31’s from Radley Chevrolet to upgrade a 83 Silverado to fuel injection. Fast shipping, the price was right, and the transaction was handled professionally


What EFI setup did you use?

Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5194990 08/23/19 08:40 PM
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AVB Offline
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Aren't boat engines reverse rotation?

Re: Is the 5.7gm engine still made brand new? [Re: cpayne5] #5194994 08/23/19 08:44 PM
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rrwildlife Offline
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Holley Sniper


Originally Posted by cpayne5
Originally Posted by rrwildlife
https://www.gmperformancemotor.com/parts/12703983.html

https://www.ebay.com/itm/GM-OEM-NEW-CRATE-Engine-350-12530283-Chevrolet-5-7-L31R-DEALER-DIRECT-12681431/301567296304?hash=item4636cfc330:g:uxgAAOSwTC1dUc2L

I purchased one of the L31’s from Radley Chevrolet to upgrade a 83 Silverado to fuel injection. Fast shipping, the price was right, and the transaction was handled professionally


What EFI setup did you use?


2020 Toyota Corolla SE 4,000 Factory Oil/filter

2005 Toyota RAV4 - 147,000 Havoline Pro DS 5w30 Wix
Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5194997 08/23/19 08:47 PM
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clinebarger Offline
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GM Performance Parts still sells brand new 5.7L crate engines. None are intended for Marine use, Even though the Ramjet 350 is built as a marine engine (Has marine head gaskets/Brass core plugs) though I would upgrade the valve springs!!
*Some marine engines are reverse rotation, Something you need to know before doing anything.

I'm by no means a marine engine guy......Know just enough to be dangerous!!


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Is the 5.7gm engine still made brand new? [Re: AVB] #5195016 08/23/19 09:14 PM
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Chris142 Offline
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Originally Posted by AVB
Aren't boat engines reverse rotation?

Some are. If it has 2 engines one will rotate backwards to that the boat won't go lopsided.


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Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5195020 08/23/19 09:21 PM
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motor_oil_madman Offline OP
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I don't think the engine turns backwards, the transmission/outdrive does.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5195031 08/23/19 09:49 PM
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mk378 Online Content
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You would look at the balancer pulley on the front of the engine. If it turns clockwise it is the same as a car engine.

Re: Is the 5.7gm engine still made brand new? [Re: Chris142] #5195039 08/23/19 10:03 PM
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Elkins45 Online Content
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Originally Posted by Chris142
Originally Posted by AVB
Aren't boat engines reverse rotation?

Some are. If it has 2 engines one will rotate backwards to that the boat won't go lopsided.


Just mount one of your props backwards. smile

Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5195041 08/23/19 10:06 PM
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The 5.7 small block engines in boats were 4 bolt mains, similar to a truck 5.7.

There is a difference between rebuilding and remanufacturing an engine. The big companies that do engine remanufacturing have machines that the local rebuilders cannot afford. And a reman engine always changes a set number of parts whether it needs it or not. A rebuilding will change worn parts.


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Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5195050 08/23/19 10:17 PM
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Donald Online Content
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Originally Posted by motor_oil_madman
I'm looking at doing a total repower on my boat and I've always been cautious about remanufactured engines cause some engine builders take short cuts or use marginal parts.

I was thinking of having my vortec 5.7 carbed engine turned into a 383 stroker and just using a reputable shop here in Houston.


The rest of the power train needs to be able to handle the increase in power.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5195054 08/23/19 10:24 PM
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motor_oil_madman Offline OP
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It has a 4 bolt mains already and vortec heads. What else does it need? to be a 383 it will need a new crankshaft. connecting rods, etc.

Last edited by motor_oil_madman; 08/23/19 10:25 PM.

2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Is the 5.7gm engine still made brand new? [Re: motor_oil_madman] #5195078 08/23/19 11:31 PM
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clinebarger Offline
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Originally Posted by motor_oil_madman
It has a 4 bolt mains already and vortec heads. What else does it need? to be a 383 it will need a new crankshaft. connecting rods, etc.


You can run the factory 5.7" rods, The pistons will need to be swapped (Higher wrist pin height). You can also run 5.565" 400 rods but new pistons are still required.

383 is technically a .030" overbored 350/327 (4.00") block with a 400 3.75" stroke crank, We used to turn down 400 cranks before companies like Scat started offering cast & forged cranks just for this.

The increased stroke may not the best thing for a marine engine that spends its entire working life at higher RPM's, Sure.....If it's balanced well & you use top shelf Forgings, It may last longer than the original 350. Use bottom of barrel cast crank, Recon forged or powdered rods, & Cast pistons....Don't expect much in the way of longevity.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
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