Engine Dyno Results: LS3 427 639hp/610tq
06-17-2012, 10:25 AM
#1
Engine Dyno Results: LS3 427 639hp/610tq Had a LS3 427 built... see specs below
*Posting this for informational purposes! Engine was dyno'd at Westech in So Cal*
I'm in Iraq and don't have the graph with me... it has a great torque curve. A bigger cam would make more power but I was looking for all around usable power instead of peak numbers.
All forged internals @ 11.2:1 compression
Mast Motorsports "Black Label" med bore LS3 heads
Comp LSL 239/247 .624"/.624" 114 cam
stock ported LS3 intake
Ported LS2 TB
LS7 injectors
*Posting this for informational purposes! Engine was dyno'd at Westech in So Cal*
I'm in Iraq and don't have the graph with me... it has a great torque curve. A bigger cam would make more power but I was looking for all around usable power instead of peak numbers.
All forged internals @ 11.2:1 compression
Mast Motorsports "Black Label" med bore LS3 heads
Comp LSL 239/247 .624"/.624" 114 cam
stock ported LS3 intake
Ported LS2 TB
LS7 injectors
06-18-2012, 03:02 PM
#4
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Had a LS3 427 built... see specs below
*Posting this for informational purposes! Engine was dyno'd at Westech in So Cal*
I'm in Iraq and don't have the graph with me... it has a great torque curve. A bigger cam would make more power but I was looking for all around usable power instead of peak numbers.
All forged internals @ 11.2:1 compression
Mast Motorsports "Black Label" med bore LS3 heads
Comp LSL 239/247 .624"/.624" 114 cam
stock ported LS3 intake
Ported LS2 TB
LS7 injectors
*Posting this for informational purposes! Engine was dyno'd at Westech in So Cal*
I'm in Iraq and don't have the graph with me... it has a great torque curve. A bigger cam would make more power but I was looking for all around usable power instead of peak numbers.
All forged internals @ 11.2:1 compression
Mast Motorsports "Black Label" med bore LS3 heads
Comp LSL 239/247 .624"/.624" 114 cam
stock ported LS3 intake
Ported LS2 TB
LS7 injectors
Is that 4.070 bored stock block or a resleeved 4.125 bore block?
The output at the flywheel is very good.
Last edited by N2OBaby; 06-18-2012 at 03:03 PM. Reason: 1 more thought
06-18-2012, 08:43 PM
#5
I have a resleeved LS7 at 438ci (4.1" crank) with 12:1 on stock LS3 heads with lightweight s/s valves, stock LS3 intake, 92mm TB, mid length headers and tiny 235/242 .600 lift 115LSA cam. The headers were certainly choking it up but it made 530rwhp/510rwtq. The power falls flat at around 6K RPM and redline is 6600rpm. Mild road race motor.
Last edited by gnx7; 06-18-2012 at 08:54 PM.
06-19-2012, 12:15 AM
#6
Yeah, when I get home I'll be putting it in the C6!
I was really thinking of swapping out the 6L80e for a 4L65e via RPM or Race Proven Motorsports...the block is a stock bored 6.2 LS3.
gnx7- Hmmm... I would love to see about 530 at the wheels but I've been heartbroken in the past with stalled autos. See sig with my old '98 fbody. I also have 2" American Racing headers that will help this thing breathe!
Overall, it should be a fun N/A car that might go to the track once to hopefully get that 10 second time slip. The car ran a best of 11.3x at 123mph with AFR 205's and a 224 cam, stock intake, ARH 1 3/4 and Corsa Sports on the stock converter with 17" Hoosiers.
I was really thinking of swapping out the 6L80e for a 4L65e via RPM or Race Proven Motorsports...the block is a stock bored 6.2 LS3.
gnx7- Hmmm... I would love to see about 530 at the wheels but I've been heartbroken in the past with stalled autos. See sig with my old '98 fbody. I also have 2" American Racing headers that will help this thing breathe!
Overall, it should be a fun N/A car that might go to the track once to hopefully get that 10 second time slip. The car ran a best of 11.3x at 123mph with AFR 205's and a 224 cam, stock intake, ARH 1 3/4 and Corsa Sports on the stock converter with 17" Hoosiers.
06-19-2012, 03:16 PM
#7
Yeah, when I get home I'll be putting it in the C6!
I was really thinking of swapping out the 6L80e for a 4L65e via RPM or Race Proven Motorsports...the block is a stock bored 6.2 LS3.
gnx7- Hmmm... I would love to see about 530 at the wheels but I've been heartbroken in the past with stalled autos. See sig with my old '98 fbody. I also have 2" American Racing headers that will help this thing breathe!
Overall, it should be a fun N/A car that might go to the track once to hopefully get that 10 second time slip. The car ran a best of 11.3x at 123mph with AFR 205's and a 224 cam, stock intake, ARH 1 3/4 and Corsa Sports on the stock converter with 17" Hoosiers.
I was really thinking of swapping out the 6L80e for a 4L65e via RPM or Race Proven Motorsports...the block is a stock bored 6.2 LS3.
gnx7- Hmmm... I would love to see about 530 at the wheels but I've been heartbroken in the past with stalled autos. See sig with my old '98 fbody. I also have 2" American Racing headers that will help this thing breathe!
Overall, it should be a fun N/A car that might go to the track once to hopefully get that 10 second time slip. The car ran a best of 11.3x at 123mph with AFR 205's and a 224 cam, stock intake, ARH 1 3/4 and Corsa Sports on the stock converter with 17" Hoosiers.
Deff a nice setup. Let me know if you have any questions about the swap. Stay safe over there.
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06-22-2012, 06:31 AM
#9
Firstly, thanks for your service! 
My 427 is a Darton sleeved LS2 build. 4.125x4.00. WCCH Stage three L92 heads. Cam is considerably smaller than yours. "Modified" FAST 102 and a Nick Williams 107mm TB.
Engine dyno numbers were 656/615 as I remember.
RW numbers in sig. This is a VERY mild build that I can cruise a 600RPM in 6th gear and pull away cleanly.
Build thread.
https://ls1tech.com/forums/generatio...b-c-d-e-f.html
It's in this:
My 427 is a Darton sleeved LS2 build. 4.125x4.00. WCCH Stage three L92 heads. Cam is considerably smaller than yours. "Modified" FAST 102 and a Nick Williams 107mm TB.
Engine dyno numbers were 656/615 as I remember.
RW numbers in sig. This is a VERY mild build that I can cruise a 600RPM in 6th gear and pull away cleanly.
Build thread.
https://ls1tech.com/forums/generatio...b-c-d-e-f.html
It's in this:
06-22-2012, 09:42 PM
#10
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Really Nice torque!! I'd rather have more weight with a 4L80E than mess with 65e stuff, even with the Billit 6 pinion planetary your still limited somewhat IMHO
06-24-2012, 11:40 PM
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I have a resleeved LS7 at 438ci (4.1" crank) with 12:1 on stock LS3 heads with lightweight s/s valves, stock LS3 intake, 92mm TB, mid length headers and tiny 235/242 .600 lift 115LSA cam. The headers were certainly choking it up but it made 530rwhp/510rwtq. The power falls flat at around 6K RPM and redline is 6600rpm. Mild road race motor.
06-26-2012, 11:10 AM
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