Cam decision (one day only)
Ok smarty pants if you read my post, i said heads, not intake.
Check attachment: Red line is stock LS7 heads. Blue is their slight port work to extend the flow.
AND
From Richard at WCCH:
Care to dispute two independent sources?
Have a good night!
Check attachment: Red line is stock LS7 heads. Blue is their slight port work to extend the flow.
AND
From Richard at WCCH:
I recently flow tested a new pair of LS7 heads and intake manifold. I realize LS7 head flow data has been previously posted but I thought I’d add a bit more data to the mix. The heads were casting #8452. The test valves are oem. Apparently the titanium intake valves are on hiatus for a while, but I managed to scare up a couple for testing and mockup. The intake head flow is as follows:
Lift __.100 _.200 _.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650 _.700
#1 Int. 75.5 162.7 245.5 279.1 305.8 326.4 344.5 360.2 370.7 333.7 336.1
#2 Int. 75.3 163.5 244.0 277.0 303.8 323.7 342.2 359.4 370.6 332.3 335.9
The heads were tested on a SF 600 flow bench.
The intake ports were tested with a radius flow plate on a 4.155” test bore.
I then tested the same ports with an LS7 intake manifold bolted in place:
#5 Int. 74.9 157.7 228.2 254.8 276.9 293.9 306.5 317.4 325.4 331.4 302.2
#7 Int. 75.0 158.3 227.6 254.5 276.0 293.7 306.5 316.9 326.0 331.4 304.8
Due to word wrapping I trimmed a couple of lift points off below .300" and above .700".
As you can see the intake manifold extended the flow peak by .050”, though it reduced peak flow by 45cfm. The flow peak is within the designed lift curve. This is very impressive flow under the peak. Great job designing and machine finishing the ports, chambers and seats.
On the exhaust side, the exhaust ports flow is as follows:
Lift ___.100 _.200 _.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650 _.700
#1 Exh. 57.5 118.8 176.7 207.3 221.7 229.7 235.9 240.8 243.9 246.2 247.9
#2 Exh. 26.2 115.4 168.5 194.4 206.2 213.4 218.5 222.9 225.6 227.8 228.9
The #1 exhaust port was tested with a 1.875” dia. Pipe 2.5” long.
The #2 exhaust port was tested with out a test pipe.
Lift __.100 _.200 _.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650 _.700
#1 Int. 75.5 162.7 245.5 279.1 305.8 326.4 344.5 360.2 370.7 333.7 336.1
#2 Int. 75.3 163.5 244.0 277.0 303.8 323.7 342.2 359.4 370.6 332.3 335.9
The heads were tested on a SF 600 flow bench.
The intake ports were tested with a radius flow plate on a 4.155” test bore.
I then tested the same ports with an LS7 intake manifold bolted in place:
#5 Int. 74.9 157.7 228.2 254.8 276.9 293.9 306.5 317.4 325.4 331.4 302.2
#7 Int. 75.0 158.3 227.6 254.5 276.0 293.7 306.5 316.9 326.0 331.4 304.8
Due to word wrapping I trimmed a couple of lift points off below .300" and above .700".
As you can see the intake manifold extended the flow peak by .050”, though it reduced peak flow by 45cfm. The flow peak is within the designed lift curve. This is very impressive flow under the peak. Great job designing and machine finishing the ports, chambers and seats.
On the exhaust side, the exhaust ports flow is as follows:
Lift ___.100 _.200 _.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650 _.700
#1 Exh. 57.5 118.8 176.7 207.3 221.7 229.7 235.9 240.8 243.9 246.2 247.9
#2 Exh. 26.2 115.4 168.5 194.4 206.2 213.4 218.5 222.9 225.6 227.8 228.9
The #1 exhaust port was tested with a 1.875” dia. Pipe 2.5” long.
The #2 exhaust port was tested with out a test pipe.
Have a good night!
TECH Enthusiast
Joined: Jul 2004
Posts: 546
Likes: 1
From: Washington
"As you can see the intake manifold extended the flow peak by .050”
Don't know about you, but most people run their cars with the intake manifold on the car, not sitting next to a flow bench.
Ron is right, peak flow #'s mean little in performance. Its low-mid lift numbers that really matter for street cars, this is why TFS heads perform so well!
Last edited by Haans249; Jun 10, 2009 at 09:34 AM.
Thread Starter
Launching!
Joined: May 2004
Posts: 256
Likes: 0
Did you spend any time in Mahmudiyah? Only drove through it on a convoy. I was stationed at Abu Ghraib/BIAP(Liberty) my first deployment in 2004 and then up in a small base near Kirkuk called FOB McHenry in Hawijah during my second deployment in 2007 with the 2-27 Wolfhounds / 25th Inf Div.
