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Old 07-20-2018, 07:25 AM   #1006
Maniacmechanic1
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I looked at LS7 Flow charts stock this morning Wiz.

Looks impressive till you do the Race Math.

The Exhaust Ports Suck.
Extremely Weak.

Looked at Fully Pro CNC versions just barely High Po street .
Not Drag Race like my Pontiac heads.

The E/I Ratio falls .60 to .66 stock.LS7.

Killing Tremendous Hp and Torque.

I will look at LS3.
Gotta Be Mother Fucking Better.
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Old 07-20-2018, 07:46 AM   #1007
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Stock LS3 Heads are better than LS7.

Has a few problem areas.

E/I ratio is at .80 to 1 at .400" valve lift.
Drops off.
Comes back pretty strong at .500.

At high lifts .700 intake port is tapped out.

Looking at the flow curve its not so bad.
Ideal cam would have .550-.575 valve lift.

Has porting potential of course.
A million ways to rework by hand or CNC.

Far superior to LS7.
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Old 07-20-2018, 07:50 AM   #1008
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Huge flow intake ports are Worthlessness without exhaust ports to match.

Often exhaust ports can not be improved.

Solution is to Expoy and reshape intake ports.
Actually kill flow.
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Old 07-20-2018, 08:06 AM   #1009
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None of Those Mother Fucking Retards over on Corvette Forum caught the problem.

Took a Pontiac Guy.
Me.
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Old 07-20-2018, 11:28 AM   #1010
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Quote:
Originally Posted by Maniacmechanic1 View Post
Stock LS3 Heads are better than LS7.

Has a few problem areas.

E/I ratio is at .80 to 1 at .400" valve lift.
Drops off.
Comes back pretty strong at .500.

At high lifts .700 intake port is tapped out.

Looking at the flow curve its not so bad.
Ideal cam would have .550-.575 valve lift.

Has porting potential of course.
A million ways to rework by hand or CNC.

Far superior to LS7.

Did you really type this?
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Old 07-20-2018, 01:31 PM   #1011
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Did you really type this?
http://garage.grumpysperformance.com/index.php
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Old 07-20-2018, 04:33 PM   #1012
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None of Those Mother Fucking Retards over on Corvette Forum caught the problem.

Took a Pontiac Guy.
Me.

Yup, I bet you got much the same reaction over there as you are getting right here, right? Now do you think this is because you alone know better than the whole world? OR more likely do you think you might be mistaken?


Did you know gm made special rocker arms for the LS7 heads? Probably not, right? Well they did. And not just for the higher 1.8 ratio, either. They had to offset some of the rockers. And as such intake and exhaust rockers are not interchangeable with LS7 heads only. Instead of thinking you can school me here, why don't you go do some homework on why the rockers are different for LS7 heads.
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Old 07-20-2018, 04:50 PM   #1013
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Originally Posted by Maniacmechanic1 View Post
Has porting potential of course.
A million ways to rework by hand or CNC

CNC or nothing bud. You wouldn't put a rotating assembly together without balancing it. And the same goes for airflow through the heads. This is especially true for the extremely sensitive controllers in late model cars. Hand porting all to often leads to unequal amounts of air reaching the cylinders. Not that this should matter to someone who can't see farther than 1320ft, right? But this is very important if you want to live a long happy life. run smooth and not foul out some of your spark plugs.


And measuring the amount of water you pour into the runner is not a flowbench. Nor does it imply that all runners were ground equally or will flow equally
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Old 07-20-2018, 06:49 PM   #1014
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CNC or nothing bud. You wouldn't put a rotating assembly together without balancing it. And the same goes for airflow through the heads. This is especially true for the extremely sensitive controllers in late model cars. Hand porting all to often leads to unequal amounts of air reaching the cylinders. Not that this should matter to someone who can't see farther than 1320ft, right? But this is very important if you want to live a long happy life. run smooth and not foul out some of your spark plugs.


And measuring the amount of water you pour into the runner is not a flowbench. Nor does it imply that all runners were ground equally or will flow equally
What The Fuck is Wrong with You ?

You have the Better Engine in your C5.
The LSX 376 B8.
LS3 HEADS ON IT.

Fuck That Pro Tour Car.
Heads no Good.
Show and notta.

Just Need $$$$ to Boost Your C5.
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Old 07-20-2018, 06:50 PM   #1015
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Yup, I bet you got much the same reaction over there as you are getting right here, right? Now do you think this is because you alone know better than the whole world? OR more likely do you think you might be mistaken?


Did you know gm made special rocker arms for the LS7 heads? Probably not, right? Well they did. And not just for the higher 1.8 ratio, either. They had to offset some of the rockers. And as such intake and exhaust rockers are not interchangeable with LS7 heads only. Instead of thinking you can school me here, why don't you go do some homework on why the rockers are different for LS7 heads.
The Heads suck.

Terrible exhaust ports.
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Old 07-20-2018, 08:17 PM   #1016
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The Heads suck.

Terrible exhaust ports.
OK, OK. So one more time. just to make sure. You are saying these exhaust ports are terrible??



I need you to explain your position on this. Because I just ain't seeing it. Those exhaust ports bring a tear to my eye and I would swap them with my stock ls3 heads in a New York Minute if I could.
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Old 07-20-2018, 08:30 PM   #1017
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Quote:
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Quote:
Originally Posted by Maniacmechanic1 View Post
The Heads suck.

Terrible exhaust ports.
OK, OK. So one more time. just to make sure. You are saying these exhaust ports are terrible??

Can they be improved on with some hand blending. Look let's be real big dollar heads are cnc to do the rough cut the final clean up is done by hand. Why other wise would people send there brand new cnc heads out to porter. I will tell you why 20 to 40 extra hp. What is Tony Mamo's bread and butter? Porting then hand blending.
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Old 07-20-2018, 08:36 PM   #1018
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Can they be improved on with some hand blending.
No. No they can not. They can be messed up beyond repair by hand grinding on such a precision piece. I know this is the part where you explain to me how your eye-crometer is more accurate and balanced than CNC, right?
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Old 07-20-2018, 08:40 PM   #1019
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OK, OK. So one more time. just to make sure. You are saying these exhaust ports are terrible??



I need you to explain your position on this. Because I just ain't seeing it. Those exhaust ports bring a tear to my eye and I would swap them with my stock ls3 heads in a New York Minute if I could.
2 ways to view Wiz.
The Intake Ports are too Big.

The Exhaust Ports are too small.

Just because it's Shiny does not mean it's right.
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Old 07-20-2018, 08:43 PM   #1020
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Can they be improved on with some hand blending. Look let's be real big dollar heads are cnc to do the rough cut the final clean up is done by hand. Why other wise would people send there brand new cnc heads out to porter. I will tell you why 20 to 40 extra hp. What is Tony Mamo's bread and butter? Porting then hand blending.
You use the right tool for the right job. If you have a 50+ year old engine design with a carb and some ancient magneto ignition then sure take a Dremel to your stuff and "experiment" maybe you will learn from it. You do NOT hand grind on LS engine heads. If only because of the hell it will play with the controller.
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