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!

 

Mods, if this thread is more appropriate in the Gen IV section, please move.

Thanks for moving the thread.

 

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.

 

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.

 

Might be cheaper to grab a used ls7 short block. 427 are not too shabby

 

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.

 

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.

 

Can get a 454 on a LS next block for 6k from shafiroff. I almost did but went 428 instead

 

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?

 

Nice! Any 1/4 mile times?