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LS3 specs

11K views 33 replies 11 participants last post by  Jinx 
And you should add......."and it belongs under the hood of a 5th gen".
I wish. Im waiting for that day when GM says yea or nay on that.:BangHead:
 
x2 on that....we can only pray and hope that's their plans.
I do enough praying to baby jesus everynight for everyone on this forum. lol.
 
Awwwww Jinxy...

While I want the LS3 to be in the 5th gen (for the uber enthusiast's sake). I'd be happy with the L76 in mine, personally. :p
MAY BABY JESUS DEVOUR YOUR SOUL!
 
Sorry I really want my **** LS3. Even if baby jesus damns you, I still your friend. Hell, I still have some mustang friends, for proof. lol.
 
I hope the motor is full power. In the Camaro. it won't be able to run with the C6 so why not in my opinion. But I can't wait to see how some of these Vette guys are going to act when they buy a ZO6 and don't have a choice but to work with the supercharger or do a turbo. But then again they might not even care. U could always buy the C6.

Also the LS3 has LS7 style heads doees any one have LS3 flow numbers for comparison?
4.030” test bore
Lift ___.100 _.150_.200_.250_.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650_.700_.750
#1 Int. 74.9 109.4 154.4 193.5 225.3 252.8 274.6 292.7 308.8 321.0 328.7 326.6 310.0 316.6
#1 Exh. 63.6 97.9 126.1 148.7 162.3 178.6 189.6 197.6 205.5 210.7 214.6 217.8 221.2 223.5
The intake was tested with a radius plate and the exhaust was tested with a 2 ½” stub pipe.

4.155” test bore
Lift ___.100 _.150_.200_.250_.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650_.700_.750
#1 Int. 73.8 108.7 153.2 192.6 225.2 253.6 277.0 296.7 313.0 326.0 335.8 326.9 327.3 317.1
#1 Exh.61.1 97.9 125.7 148.1 162.0 179.5 191.8 200.1 205.9 213.3 218.4 220.9 221.9 223.2
The intake was tested with a radius plate and the exhaust was tested with a 2 ½” stub pipe.

Exhaust port tested without pipe (4.155” bore).
Lift ___.100 _.150_.200_.250_.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650_.700_.750
#1 Exh.63.1 94.7 121.1 140.6 156.9 165.8 176.1 182.8 187.9 191.4 193.7 195.6 197.6 199.5

Valve dimensions:
Intake = 2.160” X 4.870” X .314”(8mm)
Exhaust = 1.590” X 4.920” X .314”(8mm)

Seat/throat diameters:
Intake = 1.870”
Exhaust = 1.355”

Volumes:
Intake runner = 260.6cc
Exhaust runner = 90.0cc
Chamber = 69.8cc

And those are the numbers on the L92 heads, which are the same casting. It also doubles as a deluxe PEZ dispenser.
 
Ok, here is how to read it :

For example, on the 4.030” test bore with a lift of .100, on the first chamber on the intake port 74.9 CFM and 63.6 CFM on the exhaust port.

CFM= Cubic Feet per minute
Lift is how much the valve is open
 
Dont worry about it. It good numbers. Be happy. Someone asked for flow numbers, i gave them flow numbers. I cant think of a better way to break it up. But to understand the flow results just read the first line (.100), then under that (74.9 CFM for intake and under that (63.6 CFM) for exhaust.

You are going to love this forum when the 5th gen comes out and topics like this will come up. I was brain-dead this when I was in high school, but after working with F-16s in USAF and then working in a FAA repair/rebuild station for Lycoming and Continental engines; understanding flow capablities, drag, and etc became common knowledge. These numbers are directly from the Tech section of LS1tech, I hate to direct you to another forum to help you understand but, LS1tech is good info. I recommend just reading. The members can become over zealous at times.
 
I'm way too drugged and tired right now.... I read "The member can become over zealous at times." and started giggling.
Im 7 beers and tired myself. I corrected it.
 
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