LS7 head flow numbers: 348 int/219 exh @.600 lift
02-23-2005, 09:55 PM
#1
10 Second Club
Thread Starter
iTrader: (15)
Join Date: Nov 2001
Location: St. Michael, MN.
Posts: 4,519
Likes: 0
Received 0 Likes
on
0 Posts
LS7 head flow numbers: 348 int/219 exh @.600 lift Check out this link. These numbers are almost exactly what is posted in the new issue of Corvette Fever. Incredible numbers. but they are flowed at 4.125 bore. I find it hard to believe any tuner can improve on these heads. Mike Chapman who is a revered head porter in the Mopar circles worked with GM on these. Judging by the tone of his post, I'm led to believe this is him or someone who access to this information.
http://www.gearchatter.com/viewtopic11202.php
They also have a pretty cool Gen III cam database of specs that is pages long. something *ahem* we could use here.
http://www.gearchatter.com/viewtopic11202.php
They also have a pretty cool Gen III cam database of specs that is pages long. something *ahem* we could use here.
02-23-2005, 11:14 PM
#4
On The Tree
Join Date: Sep 2004
Location: Naperville
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 11 Bravo
Crazy numbers for GM castings out of the box. But I'm sure thay could be improved uopn. My 6.0l heads flow almost 30cfm more on the exhaust at .600 with a smaller 1.60 valve.
Last edited by stik6shift93; 02-24-2005 at 01:28 AM.
02-24-2005, 11:14 AM
#5
Yea and it is only going to dyno 440 rwhp....I may be eating crow but I tell you this thing is underrated or the valve timing is incredibly tame. What would those heads and that cam do on a 346?
Trending Topics
02-24-2005, 09:26 PM
#8
Those numbers aren't very impressive at all for a 4.125" bore with a 2.20" intake and a 1.615" exhaust valve on a CNC'd head! My LPE CNC'd LS6 heads with 2.02"/1.57" valves flowed 301 CFM at 0.500" on a small bore versus the LS7's 315cfm on a large bore and my exhaust numbers were 218CFM at 0.500" vs 207cfm for the LS7. I hope the production LS7 heads are a heck of a lot better than that!!!
02-24-2005, 10:08 PM
#9
10 Second Club
Thread Starter
iTrader: (15)
Join Date: Nov 2001
Location: St. Michael, MN.
Posts: 4,519
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by John B
Those numbers aren't very impressive at all for a 4.125" bore with a 2.20" intake and a 1.615" exhaust valve on a CNC'd head! My LPE CNC'd LS6 heads with 2.02"/1.57" valves flowed 301 CFM at 0.500" on a small bore versus the LS7's 315cfm on a large bore and my exhaust numbers were 218CFM at 0.500" vs 207cfm for the LS7. I hope the production LS7 heads are a heck of a lot better than that!!!
02-25-2005, 04:45 PM
#12
Yeah, but what did they flow above .500? I doubt 348 cfm at .600 and they probably fell off after that. The LS7 heads just keeps going, where a ported LS1/LS6 head falls off. It's obvious this is going to be a high revving engine that will really wake up with a bigger cam and maybe some long tube headers with no cats.
02-25-2005, 04:52 PM
#13
TECH Apprentice
Join Date: Oct 2004
Posts: 329
Likes: 0
Received 0 Likes
on
0 Posts
Like I said, my guess is with porting 300CFM@.400" will be reality and 350CFM@.50"
400 or so will be in the .600" and greater. My guess is the meat is there to support it. Lets pray it is.
What happens is the 500HP that these things ship with, will become
head and cammed and exhausted 700HP cars.
400 or so will be in the .600" and greater. My guess is the meat is there to support it. Lets pray it is.
What happens is the 500HP that these things ship with, will become
head and cammed and exhausted 700HP cars.
02-25-2005, 05:03 PM
#14
10 Second Club
Thread Starter
iTrader: (15)
Join Date: Nov 2001
Location: St. Michael, MN.
Posts: 4,519
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Big-DEN
My guess is the meat is there to support it. Lets pray it is.
John - I agree about time spent at lower lift is where it's at for a street car. But for race or near race applications, these heads should open a whole new world for max effort cars. Time will tell.
04-05-2005, 09:12 AM
#16
The intake flow numbers are impressive for a factory out-of-the-box head, but those exhaust numbers are somewhat weak. Here is a flow sheet from my old Formula, just a set of MTI hand ported LS6 castings from over 2 years ago when I had the car.
Tony
Tony
no way
04-06-2005, 07:18 AM
#19
SSU'S Vice Mod
Join Date: Jul 2004
Location: Hazard Co. Maryland
Posts: 2,391
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by DrkPhx
I would agree. The reason for the offset intake rocker is to allow more material for CNC porting.
John - I agree about time spent at lower lift is where it's at for a street car. But for race or near race applications, these heads should open a whole new world for max effort cars. Time will tell.
John - I agree about time spent at lower lift is where it's at for a street car. But for race or near race applications, these heads should open a whole new world for max effort cars. Time will tell.
I'm trying to think of the articles and pics that I've seen thus far (which isn't working right now) but when you say the rocker is offset, is it also canted like a "semi hemi's" valve would be? (Not splayed like a big block but canted). I love the speculation here, but, we'll just have to play the wait and see game. More than likely these products will be scarce @ first and hella expensive.
04-06-2005, 07:42 AM
#20
TECH Junkie
iTrader: (9)
Join Date: Dec 2001
Location: WA
Posts: 3,326
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by sb427f-car
I'm trying to think of the articles and pics that I've seen thus far (which isn't working right now) but when you say the rocker is offset, is it also canted like a "semi hemi's" valve would be? (Not splayed like a big block but canted).
