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LS2 vs LS3

 
Old 01-04-2019, 06:04 PM
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Question LS2 vs LS3

Hi!

I recently got into a 2004 C5 Corvette. I'm looking to the (distant) future on a 400+ci build. I've noticed quite a few C5 builds using an LS2 base for the build, typically 402ci. Alternatively, a common large cube package using the LS3 is 441ci.

Considering the are both Gen Iv blocks, is there a reason to prefer the LS2 over the LS3? I would think in either case, you have the same set of problems to solve for replacing an LS1/LS6.

Thanks for reading!
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Old 01-04-2019, 06:06 PM
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Mods, if this thread is more appropriate in the Gen IV section, please move.

Thanks for moving the thread.

Last edited by bigsapper; 01-04-2019 at 08:05 PM.
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Old 01-07-2019, 07:27 AM
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LS2 vs LS3

I've read the LS2 block is better if one plans to do a sleeved set up. It's been said LS2 blocks can sometimes go .030 over for 4.030 bore. I don't know how common those block are to find.

LS2 blocks seem to be less expensive.
New LS2 block under $1,300
New LS3 block over $1,900

​​​The LS3 has the bigger stock bore.

LS2 402/408 stroker vs LS3 416 stroker - the difference ~8 to 14 cubes. Say 10 to 15 hp for NA applications. Is that worth $600? I would say depends on the person and their budget.
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Old 01-07-2019, 08:00 AM
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Thanks. Ideally, I'd like to go 454. Saw a Tony Mamo build just went up for sale. 2 years too soon for me, lol.
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Old 01-07-2019, 08:20 AM
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Might be cheaper to grab a used ls7 short block. 427 are not too shabby
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Old 01-07-2019, 08:18 PM
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Definitely agree that a used LS7 short block would be much better bang for the buck vs making a 454 out of an LS2 or LS3.
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Old 01-07-2019, 09:35 PM
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Looking around at some of these builds, I might get to my performance goals with a little smaller ci. Looking to hit 10.9x in 3,500 DA without going over .600 lift. I've seen a couple of 402 LS2 builds that are right there, but too much lift & converter than I want. Figured I'd make it up with cubes.

I have a strong preference to go 454. Looking at the RHS block, too.
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Old 01-07-2019, 10:32 PM
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Can get a 454 on a LS next block for 6k from shafiroff. I almost did but went 428 instead
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Old 01-15-2019, 04:23 AM
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LOOK at my SIG. this is what my lowly LS2 is up to without much work. About to bolt a set of TRICK flows on, wonder what that will do?
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Old 01-15-2019, 06:18 AM
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Nice! Any 1/4 mile times?
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