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LS2 402 vs. LS3 418

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Old Jan 15, 2013 | 08:07 PM
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Default LS2 402 vs. LS3 418

Ok so now that im confused as hell and wasnt really clear about what i want in my previous post I currently have an LS2 block and an 86 I-ROC. My goal is a 550-600 hp driven on the weekends raced about 40% of the time. I would like to know how to achieve this goal and which route would be easier/more cost efficient: Sticking with the LS2 or selling the block and going with the LS3 shortblock from Texas Speed. From some great advice im leaning towards LS3 im confused SOMEONE HELP!!!!!!!
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Old Jan 15, 2013 | 08:11 PM
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I'd just go with selling your LS2 block and getting the LS3 short block from Texas Speed. No replacement for displacement and the LS3 heads would flow more air through that LS3 short block.
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Old Jan 15, 2013 | 08:14 PM
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Thats what i was thinking. I do have ported LS3 heads and intake ready to go but i was told for that amount of power get different heads and intake.
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Old Jan 15, 2013 | 08:14 PM
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Ls3 has the 4.065 bore you'll need and a 416 with a Mast head or TSP's LS7 small bore head will get the goal your looking to get.
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Old Jan 15, 2013 | 08:21 PM
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Originally Posted by litle88
Ls3 has the 4.065 bore you'll need and a 416 with a Mast head or TSP's LS7 small bore head will get the goal your looking to get.
Thats exactly what I told him in the other thread lol
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Old Jan 15, 2013 | 08:24 PM
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Yea i trust ya just needed second opinion thanks!
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Old Jan 15, 2013 | 08:59 PM
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Just want to make sure the LS3 is the most bang for the buck and the extra $ spent is worth it
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Old Jan 15, 2013 | 09:05 PM
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Definitely would go 416... what I plan on doing.
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Old Jan 15, 2013 | 09:09 PM
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Awesome thanks matt
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Old Jan 15, 2013 | 11:24 PM
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If ur LS2 is stroked already with the 402 package, I would stay with it. I am only saying that because u used the phrase best bang for the buck. If its just a LS2, then sell it and go with the LS3 shortblock. Hell get crazy and just get the LS7 short block with ur LS3 heads and watch them shine!! Think very carefully what u wat to do, it is going to cost money to build the shortblock to the long block. im assuming you dont have an LS engine to remove the other parts like the valley cover, oil pan, etc. If this is true, fork out the cash and buy the long block or the complete turn key engine packages some sponsors offer. Just my opinion, something to think about.
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Old Jan 16, 2013 | 12:45 AM
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Alls i have is the LS2 block and port matched heads intake. I have someone to buy the oil pan from and stuff. Thinking about it it might just be easier to buy EVERYTHING from texas speed (except the tranny) and hopefully theyll package it up and hopefully give a good military discount right? I have a limit of $25gs for my total project but that includes a moser the LS conversion kit (3rd gen) and tranny.

Last edited by 86Z28USAF; Jan 16, 2013 at 12:52 AM.
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Old Jan 16, 2013 | 07:29 AM
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Alls i have is the LS2 block and port matched heads intake.
What heads do you have now? A 402 LS2 based engine with killer cathedral port heads (TFS/AFR 235-245) should be able to make that power.
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Old Jan 16, 2013 | 10:12 AM
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Originally Posted by 86Z28USAF
Alls i have is the LS2 block and port matched heads intake. I have someone to buy the oil pan from and stuff. Thinking about it it might just be easier to buy EVERYTHING from texas speed (except the tranny) and hopefully theyll package it up and hopefully give a good military discount right? I have a limit of $25gs for my total project but that includes a moser the LS conversion kit (3rd gen) and tranny.
Sounds like you havent sat down and really calculated out everything you need. If all you have is a short block you are going to need at least a couple thousand dollars of misc not including heads...... Hope you have plenty of ink on that pen of yours. Good luck with the build!
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Old Jan 16, 2013 | 12:14 PM
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what the OP didnt mention in this thread is that he has $25,000 to spend.

All he has is an ls2 block and some ls3 heads, he could easily sell those and recoupe most of his money and go with something much nicer.


ls3, stroked, forged, mast ls7 heads, fast intake, spec'd cam, he knocking down 600rwhp with driveability to boot
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Old Jan 16, 2013 | 02:31 PM
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im definitely going on what Tainted said
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Old Jan 16, 2013 | 06:40 PM
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Originally Posted by Tainted
what the OP didnt mention in this thread is that he has $25,000 to spend.

All he has is an ls2 block and some ls3 heads, he could easily sell those and recoupe most of his money and go with something much nicer.


ls3, stroked, forged, mast ls7 heads, fast intake, spec'd cam, he knocking down 600rwhp with driveability to boot
Agreed!^ seems like the best thing he can do is sell what he has now and buy a stroked forged LS3 and go on from there.
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Old Jan 16, 2013 | 08:00 PM
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yea im def goin with that best bang for my buck cant wait 6 months this will commence
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Old Jan 16, 2013 | 08:07 PM
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sell the ls2 block but keep the oil pan , front timing and rear covers, keep the ls3 heads and intake you have and get an LS3 stroker bottom end .. good starting point ..
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Old Jan 16, 2013 | 08:49 PM
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for the same price as a stroker or maybe for a few hundred more, you can resleeve a 5.3 and make a 427.......and have a 4.125 bore......awesome head choices when you get that big of bore
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Old Jan 16, 2013 | 08:50 PM
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Re-sleeve the LS2 block. Go with a 4.125 inch bore.

ERL

Have TSP or ERL (If you go ERL they'll build it then you send them your core) build you a short block with a 4" crank for a 427 or a 4.125 inch crank for a 441.

Port your LS3 heads or sell them and buy an aftermarket set.

You'll hit your number.

Last edited by FLYZNTN; Jan 16, 2013 at 09:00 PM.
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