Jakson

iTrader: (50)

Figured I would share this, got my 5.3 done this week and dyno'd it today. I built it for boost, so it's only 9.5:1 compression. It has a 239/243 .623/.623 116 cam, installed 112ICL. Stock LS3 intake, LS3 heads. 4.020 bore x 3.276 (4.8L) stroke.

Looking to double this output and then some, with the turbo setup very soon. I just have to buy some fuel system parts so I can feed the beast. It is on E85 also. The turbo system will consist of a C6/truck manifold hot side, PT8847 .96 turbo, with a 4" down pipe. Those results coming soon!

It made right at 500hp @ 7000RPM / 430 ft lbs. @ 5400RPM today naturally aspirated.

[youtube]DxUTC37i_bQ[/youtube]
[youtube]TLp_UzPX_c8[/youtube]



Build thread is here in the FI section if you want to take a look.
https://ls1tech.com/forums/forced-in...stock-rad.html

TexasTarnation

Clean build, I like those numbers. Any reason you went with a 5.3 over the lq9 everyone is useing? Seems like most lq9's with that same setup are only netting about 450hp.

BottleFedZ346

iTrader: (17)

Never seen LS3 heads on top of a 5.3!

Hmmmm, none the less those are good #'s!

redtan

iTrader: (5)

So it's not really a 5.3, more like 5.45...

But still, nice to see a relatively big bore short stroke motor, bet that bitches likes to rev.

bww3588

iTrader: (49)

I like it. Very nice. Should be a screamer with some boost.

bww3588

iTrader: (49)

They won't work on a standard bore 5.7 or smaller. 4.00 minimum. I don't think the aftermarket small bore ls3 heads will work either. None the less, I've been wanting to see a set of ls3 heads on a short stroke engine. Looks like the work well. I would like to see the torque and power curve down low as well. Any dyno sheets?

ls1ya

iTrader: (2)

Whats the short block consist of? I was thinking about something like this the other night.

LS6

With this CR the power is extreme good

TrentSS

Look at the engines Chevrolet is building for the whippeled (2.9L & 4.9L) 327ci COPO camaros. They're using a 4.065" bore on a 3.150" stroke!

Not to mention the fully CNC'd LS7 heads with 275cc intake port volume, 89cc exhaust port volume, 70cc combustion chamber volume. This is all in an LSX iron block. Hot Rod did a full article on it in the August '12 issue. In testing GM spun these things to 8 grand no problem...and it's available as a crate motor.

COPO 327/4.0L - supercharged engine GM Part# 17802827.

Great results Jakson! Can't wait to see what the turbo adds.

Jakson

iTrader: (50)

Yep it comes out to a 5.4, its a 332 cubic inch. It's just more fun to call it a 5.3 with LS3 heads because it throws people off a little. I have dyno sheets but forgot them at work, I will get them tomorrow.

Short block consists of a 2004 LQ9 6.0 block, bored .020 over. A stock 2006 4.8L crankshaft with an LME billet 24x reluctor. Callies Compstar H beam SBC 6.300" rods, and Diamond 4.020" pistons which I moly coated the skirts, and ceramic coated the tops. A comp 239/243 116+4 cam, and Morel link bar lifters. It should rev really nice, can't wait to get it in the car. Was perfectly happy going to 7500 on the dyno, even with the stock intake, was still making 485 at 7500. With some forced air behind it, turning it 7500+ shouldn't be out of the question at all, as long as the springs will make it that high.

TrentSS

A well thought out package there...keep us updated on your results.

98blueSScamaro

iTrader: (14)

great build

NemeSS

iTrader: (127)

Very good results.

chrs1313

iTrader: (24)

I knew you would get chub off of this lol

Cool build for sure I like it...keep us posted on final numbers, what's goal ET/mph or rwhp?

Jakson

iTrader: (50)

Hoping to break into the 4 digits to the wheels through the 6 speed. No goals for the strip yet, ill just wait and see how it does. I will have some boosted HP numbers by Thanksgiving hopefully!