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looking to build a 427 ls3 is this right?

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Old Apr 25, 2015 | 10:50 PM
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Default looking to build a 427 ls3 is this right?
I have a ls3 block std bore i was told by a machinist here i needed the following for my build. Eagle 4.10 crank, 6.125 eagle rods, and 4.070 forged pistons. Is this correct and a good combo??? Im looking at prc stg 2.5 6.0L heads milled to 69cc trying to get 600hp is this possible with this combo? Thanks
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Old Apr 25, 2015 | 11:46 PM
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Originally Posted by low_bowtie83
I have a ls3 block std bore i was told by a machinist here i needed the following for my build. Eagle 4.10 crank, 6.125 eagle rods, and 4.070 forged pistons. Is this correct and a good combo??? Im looking at prc stg 2.5 6.0L heads milled to 69cc trying to get 600hp is this possible with this combo? Thanks
Don't waste money on eagle!! I would stay at a 4.000 crankshaft in the block. Better overall reliability. That'll put you at a 416 ci.......

Again the 4.10 crank starts to really pull the piston out the bottom of the bore.....

As far as your goal as 600 horses.....
I would read this article.....
http://www.superchevy.com/how-to/engines-drivetrain/1247-626hp-ls3-stroker-build-supersize-me/dyno.html
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Old Apr 26, 2015 | 11:11 AM
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What brand would you use? Scat or something else... I see that they made great numbers i was thinking of getting the prc stg 2.5 ls3 heads
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Old Apr 26, 2015 | 11:36 AM
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Originally Posted by low_bowtie83
What brand would you use? Scat or something else... I see that they made great numbers i was thinking of getting the prc stg 2.5 ls3 heads
scat over eagle. K1 over scat. Callies over all of them with wiseco pistons...

Might have to shoot me a PM about the other part....
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Old Apr 26, 2015 | 12:01 PM
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IMHO if you are going with a 4.100" crankshaft I would look hard at the JE pistons. They have a good design for the slightly longer stroke.
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Old Apr 26, 2015 | 04:51 PM
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Sell the block and buy one already made. I think there's one for sale 419 ci for 5500. You will ended up spending more on parts and machine work
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Old Apr 26, 2015 | 09:24 PM
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I wouldn't do 4.1, as others have said, it pulls the pistons too far out of the bore.
I'd also look into a pre-built bottom end.
600 rwhp or fw?
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Old Apr 26, 2015 | 09:55 PM
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Fwhp ive read the articles on ls3 sroker builds that make that thanks to help on here so im certain that its possible. Im certain i can build the bottom end for around 4500 or so
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Old Apr 26, 2015 | 09:59 PM
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Also I've looked at prebuilt bottom ends but after research i dont car for aome of the parts used in them. I would rather spend the extra 500-1000 Bucks and know its solid i think
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Old Apr 26, 2015 | 10:26 PM
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Just wanted to share this build here with you also.... it's a old thread but it still gets attention due to it being a absolute beast.

https://ls1tech.com/forums/dynamometer-results-comparisons/1324130-417-cid-new-v2-afr-230-heads-now-updated-w-chassis-dyno-s.html
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Old Apr 26, 2015 | 11:24 PM
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Wow thanks again bud i actually found a set of these heads for under 1900 bucks great value for the power capabilities. Ive put my parts list for my 416 stroker im naming "Beast Mode" ...lol now i can start buying piece by piece
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Old Apr 27, 2015 | 12:55 AM
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Originally Posted by low_bowtie83
Also I've looked at prebuilt bottom ends but after research i dont car for aome of the parts used in them. I would rather spend the extra 500-1000 Bucks and know its solid i think
That's correct! I've noticed most of them advertise 4-5k for a forged short block but with not the best components but at an additional cost offer the upgrades.
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Old Apr 27, 2015 | 05:43 AM
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Originally Posted by low_bowtie83
Wow thanks again bud i actually found a set of these heads for under 1900 bucks great value for the power capabilities. Ive put my parts list for my 416 stroker im naming "Beast Mode" ...lol now i can start buying piece by piece
what heads did you find ?
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Old Apr 27, 2015 | 07:47 AM
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Originally Posted by Tuskyz28
what heads did you find ?
The AFR V2 230s
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Old Apr 27, 2015 | 07:49 AM
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Originally Posted by flintwrench69
That's correct! I've noticed most of them advertise 4-5k for a forged short block but with not the best components but at an additional cost offer the upgrades.
Exactly by the time you get quality parts you're in it way over what its worth.....
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Old Apr 27, 2015 | 08:16 AM
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Originally Posted by low_bowtie83
The AFR V2 230s
Just awesome!! Those are going to killer. Now get the man that designed that cylinder head to spec you a specific cam to match~Tony Mamo.
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Old Apr 27, 2015 | 03:28 PM
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Originally Posted by low_bowtie83
Fwhp ive read the articles on ls3 sroker builds that make that thanks to help on here so im certain that its possible. Im certain i can build the bottom end for around 4500 or so
There's a 429 ci block being sell at the forum for 4500.
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Old Apr 28, 2015 | 02:11 AM
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Been there, done that, don't do the 4.1+ stroke. Stick to a 416/4" stroke.
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Old Apr 29, 2015 | 08:43 PM
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Originally Posted by DietCoke
Been there, done that, don't do the 4.1+ stroke. Stick to a 416/4" stroke.
What about on a sleeved block? Is a sleeved block worth the extra money? NA build street/TRACK 550-600 RWHP.
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Old Apr 29, 2015 | 09:21 PM
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I was initially going to build it with a 4.100" stroke, but decided to with a 4.000". In fact DietCoke's suggestion made a big factor.
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