**Analyze 6.0L home ported flow numbers vs. CNC flow numbers**
03-20-2003, 12:19 AM
#2
TECH Enthusiast
iTrader: (14)
Join Date: Nov 2001
Location: Raleigh, NC
Posts: 519
Likes: 0
Received 0 Likes
on
0 Posts
**Analyze 6.0L home ported flow numbers vs. CNC flow numbers** First off these heads were flowed on the same SF1020 bench, same operator, at 28" H2O, on a 4.030 bore (didn't have a 3.9).
All I'd like you to do is compare the two and tell me which is better or has more potential. I think I already have an idea which, just need some direction from you guys.
The 6.0L head specs. Ferrea 2.02/1.55 valves no back cut. Swirl ramp still intact, only widened slightly. 214cc intake ports (210cc is stock), 63.5 cc chambers. Made 386 rwhp/375rwtq with T1 cam, Mac O/R, home ported TB, Hooker cat back, stock MAF, LS1 intake, stock pulley, stock tuning, limiter raised to 6.6k rpm.
Flow numbers
Lift In. Ex.
0.1 64.4 64.5
0.2 137.2 111.2
0.3 201.3 150.0
0.4 250.3 181.0
0.5 279.3 197.2
0.55 284.8 204.4
0.6 270.0 214.0
The CNC head specs. 2.02/1.57 Manley valves. 229cc intake ports, 86cc ex. ports. 62cc chambers. Swirl ramp has been removed. Since T1 cam disentigrated, I changed to a 224/222 .568 on a 112 LSA. Haven't dynoed with these heads yet. Still on stock tuning. I have pics of these heads if someone can host them. The guy I got the CNC heads from said they are supposed to have high tumble/swirl numbers.?
Lift In. Ex.
0.1 66.2 66.6
0.2 144.4 118.0
0.3 212.8 155.5
0.4 249.3 189.5
0.5 264.2 213.0
0.55 265.0 219.5
0.6 271.5 223.7
The CNC heads are on the car now. I believe someone with LS1 head porting knowledge could easliy make my 6.0s much better than the CNC heads above. I think the CNC heads already has so much material removed that there is not much one can to do them.
Who could I send the 6.0s to for some touch up work? The guy that flowed heads said that going to a 1.57 ex. valve with a back cut and a little chamber work around the exhaust valve would pick up the ex. numbers.
One other note. In town gas mileage has seemed to pick up with the CNC heads and different cam.
All I'd like you to do is compare the two and tell me which is better or has more potential. I think I already have an idea which, just need some direction from you guys.
The 6.0L head specs. Ferrea 2.02/1.55 valves no back cut. Swirl ramp still intact, only widened slightly. 214cc intake ports (210cc is stock), 63.5 cc chambers. Made 386 rwhp/375rwtq with T1 cam, Mac O/R, home ported TB, Hooker cat back, stock MAF, LS1 intake, stock pulley, stock tuning, limiter raised to 6.6k rpm.
Flow numbers
Lift In. Ex.
0.1 64.4 64.5
0.2 137.2 111.2
0.3 201.3 150.0
0.4 250.3 181.0
0.5 279.3 197.2
0.55 284.8 204.4
0.6 270.0 214.0
The CNC head specs. 2.02/1.57 Manley valves. 229cc intake ports, 86cc ex. ports. 62cc chambers. Swirl ramp has been removed. Since T1 cam disentigrated, I changed to a 224/222 .568 on a 112 LSA. Haven't dynoed with these heads yet. Still on stock tuning. I have pics of these heads if someone can host them. The guy I got the CNC heads from said they are supposed to have high tumble/swirl numbers.?
Lift In. Ex.
0.1 66.2 66.6
0.2 144.4 118.0
0.3 212.8 155.5
0.4 249.3 189.5
0.5 264.2 213.0
0.55 265.0 219.5
0.6 271.5 223.7
The CNC heads are on the car now. I believe someone with LS1 head porting knowledge could easliy make my 6.0s much better than the CNC heads above. I think the CNC heads already has so much material removed that there is not much one can to do them.
Who could I send the 6.0s to for some touch up work? The guy that flowed heads said that going to a 1.57 ex. valve with a back cut and a little chamber work around the exhaust valve would pick up the ex. numbers.
One other note. In town gas mileage has seemed to pick up with the CNC heads and different cam.