View Full Version : Increasing displacement


Sadden
02-20-2012, 05:28 PM
So i believe that with our shorter crank a stroker is out of the question. Has anyone bored one of these bad boys out?
If no is it theoretically possible?

neilownz
02-20-2012, 05:44 PM
Needs to be resleeved. It is expensive.

V8ImpSS
02-22-2012, 10:27 PM
no the stock sleeves will go out to LS1/LS6 specs, thats what I'm planning

I believe theres a guy running a stroker turbo motor, not that the car actually works with that kind of power...it was a custom made crank by one of the big dawgs Callies, Lunati, ect...

Ill_Born_ss
02-23-2012, 06:20 AM
no the stock sleeves will go out to LS1/LS6 specs, thats what I'm planning

HAAA,Haaaa Ha.....ROFL

neilownz
02-23-2012, 09:25 AM
What's the point if you can't bore out to 4 inch...

V8ImpSS
02-23-2012, 10:20 AM
HAAA,Haaaa Ha.....ROFL

Is it just on the LS4's then? I have a 5.3 h.o. Aluminum block truck motor that's a .030 over, stroked, and twin turbo on stock sleeves

neilownz
02-23-2012, 11:46 AM
Might be able to get 3.8 or a little more out of the stock ones.

It's a lot of machining to cut the old ones out etc. Darton makes sleeves for other ls motors.
http://www.dartonsleeves.com/sl_chevy.htm

94ss06gxp
02-23-2012, 12:32 PM
too expensive, it would be cheaper/more power-to-dollar if you just went with a turbo.

V8ImpSS
02-23-2012, 12:43 PM
too expensive, it would be cheaper/more power-to-dollar if you just went with a turbo.

the car tuning turbo kit is $5500 for 500hp EDIT: 500 wheel horse power

a re sleeve and rebuild with a cam, valve spring, 1.8:1 rockers, hypereutectic pistons, dod delete, and LS6 intake is what $3500-4000 tops depending on the shop for similar power numbers, theres plenty of proven LS6 combo's at or near 500 horse

Bryan921SS
02-23-2012, 02:07 PM
This thread is :eyes:

If you want to bore the engine out then do it...report back to us on the dollar amount and the dyno results.



Edit: Also you need to add 2-3K to your budget for a built trans...check out TEP for parts.

V8ImpSS
02-23-2012, 02:18 PM
There has got to be someone on here who has done it already and can shed some light on us. Or at least someone who knows for sure how big the stock sleeves can go. Either way I don't want more than 500 horse in this car, or it will be stupid for the street

Aaron_Provost
02-23-2012, 04:00 PM
Note - The turbo puts you at 500 to the wheels

94ss06gxp
02-23-2012, 04:15 PM
Note - The turbo puts you at 500 to the wheels

exactly my point.. . . I can see maybe 380-410 to the wheels with the setup you want to do.

Also remember if your cam is bigger you will need a higher stall also. just by guess how you want a 500hp N/A LS4 setup, im sure you will use a radical cam.

V8ImpSS
02-23-2012, 04:30 PM
exactly my point.. . . I can see maybe 380-410 to the wheels with the setup you want to do.

Also remember if your cam is bigger you will need a higher stall also. just by guess how you want a 500hp N/A LS4 setup, im sure you will use a radical cam.

Forgot I was comparing apples to oranges with the power numbers...whoopsie

All things equal tho that turbo kit comes with a cutout, Water/meth injection, And a high flow cat...so figure an extra 30hp minimum, and around $700, with the addition of those to the natural aspirated motor, and if you up your compression with the water meth kit you can add like 10% more power

Starting to become clear to me that either way you can end up 500 wheel horse power for about the same money...but the turbo will get you way better mileage if you can keep ur foot out of it

As far as the cam I want to use, I want to move all the power to the mid and top end because I already have too much low end power for FWD, while maintaining drivability which is #1 priority, but that doesn't mean I'll NEED a stall converter, it's the same for the turbo as far as that because of lag, the stall converter can just make you faster but only if you can plant the power, which we can't :)

ryanisl33t
02-23-2012, 05:21 PM
Might as well drop in an M6 and convert the son bitch to RWD and slap a GTO badge on it.

LS1 Racing
02-23-2012, 06:42 PM
:corn:

This will be interesting.

Our small-bore 5.3 motors lend themselves better to turbocharging than to balls-out N/A power. We just don't have the options for making cubes that the other LS motors have.

No matter what we do, we have a sub-4.00" bore and are limited to a single crank (unless we spend big $$ for a custom one), so getting to your 500 HP without FI is going to make for a high-winding screamer that probably won't be much fun on the street.

If I had $9000-$10,000 that I wanted to drop on my Impala, I'd just do a bottom-end with some decent forged flat-tops and an LS9 camshaft. I'd ditch the 243 heads in favor of some CNC'd 317s to get the compression down. Up top, I'd do an LS6 intake, FMIC and a moderately sized turbo like a 6152. I'd also get a progressive system from AlkyControl and run 100% methanol. With this combo, one could easily get to 500 WHP at about 18-20 PSI, maybe less.

The result would be a fun car that won't break shit every week.

Sadden
02-23-2012, 11:44 PM
Hmm , maybe i need to pull the heads and have a pro look at them and tell me what he thinks. I wouldnt wanna take it out to 6.0l of displacement , but adding a little displacement wouldnt hurt my feelings any.

gxp-miller-gxp
02-24-2012, 12:03 AM
dont waste your time, just get the turbo and have more manageable power for the same price. and you wont have to worry about breaking anything ( not including trans) plus doing the turbo kit you will have plenty of help and assistance from nearly anyone. if you are gong to go through all that work just sell it and buy an ls1 or ls2 or something

Ill_Born_ss
02-24-2012, 05:57 AM
So i believe that with our shorter crank a stroker is out of the question. Has anyone bored one of these bad boys out?
If no is it theoretically possible?

Sorry man, I got distracted yesterday with the boring (oversize) comments.
All the LS cranks have the same size journals and are internal length the same. The shorter part of the crank you refer to can be machined off of any of them for use in our block (xx.0 off the snout and xx.0 off the tail) reluctor wheels are changeable and the flexplates can be changed to match to accomadate the bolt pattern as in 6,8 or 9 bolt pattern.
Connecting rods are also very adaptable.
As for the max safe oversize due to the small bore (thin sleeve)this sleeve can only be opened up by 0.010 (though GM recommends max OS to be half that or less) in the 5.3 alumi block...iron blocks can safely go to 3.900. You can have it resleeved for in excess of 2500.00 and a chance of distorting the block and then gambling that there is not an internal leak shortly after the first run.

94ss06gxp
02-24-2012, 07:05 AM
I also dont see you making 500 on a ls6 intake also

crazyjoe
02-24-2012, 08:23 AM
I dont see an LS4 making 500 NA whp, period. I'd love to be proven wrong, but I just dont see it happening.

Sadden
02-24-2012, 09:29 AM
Hmmm , i always figured the ct turbo kit would be easier , it is essentially a bolton , the problem is you have to cough up alot of dough up front. If i do go that route i would wanna do an ls6intake manifold first , ive been keeping my eyes open but i havent seen any yet.

LS1 Racing
02-24-2012, 11:14 AM
All the LS cranks have the same size journals and are internal length the same. The shorter part of the crank you refer to can be machined off of any of them for use in our block (xx.0 off the snout and xx.0 off the tail) reluctor wheels are changeable and the flexplates can be changed to match to accomadate the bolt pattern as in 6,8 or 9 bolt pattern.


That's good to know that other cranks can be machined for LS4 duty. I've not heard of anyone doing this, and I wonder why. I had always heard that our shorty crank was basically "it" for our motors, but I guess anything can be machined by a skilled shop and with the right amount of $$$.


I also dont see you making 500 on a ls6 intake also


I dont see an LS4 making 500 NA whp, period. I'd love to be proven wrong, but I just dont see it happening.

It's definitely possible, especially in light of Ill_Born's info above. It just wouldn't be very streetable, as the power band would seriously move upstairs. You probably wouldn't want to drive it daily, though.