Finally results from ETP’s LS7 style heads
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Finally results from ETP’s LS7 style heads… Here’s the preliminarily break-in dyno numbers from my buddy Stroker RT’s (AKA Roy) 427CI LS2 based 427CI motor… his car is a M6 C5 Z06… full exhaust, MAF tuned, no dry sump, pump gas… pretty impressive results… 100RWHP more than stock C6 Z06!
A simmilar motor is going into my A4 98 Firebird next week... it will be a little more of a race setup so it will be interesting to see what kind of results I will get...
PS. Thanks to Jason @ Katech for rushing me out LS1/LS7 spacer kit... it was the final piece of the puzzle... I needed new injectors, so I decided to get LS7 injectors and will use the LS1/LS7 injectors adapters also from Katech...
A simmilar motor is going into my A4 98 Firebird next week... it will be a little more of a race setup so it will be interesting to see what kind of results I will get...
PS. Thanks to Jason @ Katech for rushing me out LS1/LS7 spacer kit... it was the final piece of the puzzle... I needed new injectors, so I decided to get LS7 injectors and will use the LS1/LS7 injectors adapters also from Katech...
![](http://s97997631.onlinehome.us/temp/roy/427roy.jpg)
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Where is the tq? My 408 has a fairly weak tq curve because it's got a rather large cam and my tq curve is more than that. I would have expected more tq for sure, our HP curves are similar (mine being 5-10hp more throughout the curve) up to 6000rpms, then that one runs away from mine.
Can you post the entire setup? Very curious on the cam/head specs.
Dougie
Can you post the entire setup? Very curious on the cam/head specs.
Dougie
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Originally Posted by gtodoug
Where is the tq? My 408 has a fairly weak tq curve because it's got a rather large cam and my tq curve is more than that. I would have expected more tq for sure, our HP curves are similar (mine being 5-10hp more throughout the curve) up to 6000rpms, then that one runs away from mine.
Can you post the entire setup? Very curious on the cam/head specs.
Dougie
Can you post the entire setup? Very curious on the cam/head specs.
Dougie
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Originally Posted by gtodoug
Where is the tq? My 408 has a fairly weak tq curve because it's got a rather large cam and my tq curve is more than that. I would have expected more tq for sure, our HP curves are similar (mine being 5-10hp more throughout the curve) up to 6000rpms, then that one runs away from mine.
Can you post the entire setup? Very curious on the cam/head specs.
Dougie
Can you post the entire setup? Very curious on the cam/head specs.
Dougie
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Well if it's any constelation, i first dyno'd mine in with 15 miles. Next dyno session was at 1500 miles.
First dyno was 530whp
Second was 540whp
Good luck guys setting it up. maybe playing with a/f and timing will get that tq number up.
dougie
First dyno was 530whp
Second was 540whp
Good luck guys setting it up. maybe playing with a/f and timing will get that tq number up.
dougie
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Originally Posted by gtodoug
Where is the tq? My 408 has a fairly weak tq curve because it's got a rather large cam and my tq curve is more than that. I would have expected more tq for sure, our HP curves are similar (mine being 5-10hp more throughout the curve) up to 6000rpms, then that one runs away from mine.
Dougie
Dougie
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.
Honestly, I'm hoping to see you get those numbers up a bit. 550rwhp is definately very nice, but for a 427ci with ETP LS7 heads and an aftermarket cam?? The 470tq seems low to me, although I see it does have full exhaust which I am sure could improve that alittle. By full exhaust, do you mean headers + cats + aftermarket catback, or what? I'm sure you'll pick up 10-15 hp after the motor breaks in alittle, and hopefully after break-in + some more tuning you can get that TQ up above 500.
Definately some nice numbers, and I bet after some good tuning and break-in they will be even more impressive.
Honestly, I'm hoping to see you get those numbers up a bit. 550rwhp is definately very nice, but for a 427ci with ETP LS7 heads and an aftermarket cam?? The 470tq seems low to me, although I see it does have full exhaust which I am sure could improve that alittle. By full exhaust, do you mean headers + cats + aftermarket catback, or what? I'm sure you'll pick up 10-15 hp after the motor breaks in alittle, and hopefully after break-in + some more tuning you can get that TQ up above 500.
Definately some nice numbers, and I bet after some good tuning and break-in they will be even more impressive.
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Originally Posted by vmax1500
Finally results from ETP’s LS7 style heads… Here’s the preliminarily break-in dyno numbers from my buddy Stroker RT’s (AKA Roy) 427CI LS2 based 427CI motor… his car is a M6 C5 Z06… full exhaust, MAF tuned, no dry sump, pump gas… pretty impressive results… 100RWHP more than stock C6 Z06!
A simmilar motor is going into my A4 98 Firebird next week... it will be a little more of a race setup so it will be interesting to see what kind of results I will get...
PS. Thanks to Jason @ Katech for rushing me out LS1/LS7 spacer kit... it was the final piece of the puzzle... I needed new injectors, so I decided to get LS7 injectors and will use the LS1/LS7 injectors adapters also from Katech...
A simmilar motor is going into my A4 98 Firebird next week... it will be a little more of a race setup so it will be interesting to see what kind of results I will get...
PS. Thanks to Jason @ Katech for rushing me out LS1/LS7 spacer kit... it was the final piece of the puzzle... I needed new injectors, so I decided to get LS7 injectors and will use the LS1/LS7 injectors adapters also from Katech...
![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
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Do you know the specs of the cam? Looks like either too late of an IVC or too wide of an LSA. Area under the curve is not optimized considering your outstanding choice of parts. Don't get me wrong, top-end power is very nice, but I think there's been a lot of power left on the table with this particular cam choice. Most purpose-built NA motors (not dual purpose) should make 1.25 times their displacement in torque. That's 534 tq for a 427.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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Originally Posted by Patrick G
Do you know the specs of the cam? Looks like either too late of an IVC or too wide of an LSA. Area under the curve is not optimized considering your outstanding choice of parts. Don't get me wrong, top-end power is very nice, but I think there's been a lot of power left on the table with this particular cam choice. Most purpose-built NA motors (not dual purpose) should make 1.25 times their displacement in torque. That's 534 tq for a 427.
When you say 1.25 X displacment in torque, is that based on the numbers at the crank?
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If his heads flow so well do you think maybe they cost him low end torque? Or would too big of cam or too much LS do this. I made 470 rwtq out of my 395 cu". Just wandering I am about to start another motor and just seeing what everyones vuse are.
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Originally Posted by vmax1500
Finally results from ETP’s LS7 style heads… Here’s the preliminarily break-in dyno numbers from my buddy Stroker RT’s (AKA Roy) 427CI LS2 based 427CI motor… his car is a M6 C5 Z06… full exhaust, MAF tuned, no dry sump, pump gas… pretty impressive results… 100RWHP more than stock C6 Z06!
A simmilar motor is going into my A4 98 Firebird next week... it will be a little more of a race setup so it will be interesting to see what kind of results I will get...
PS. Thanks to Jason @ Katech for rushing me out LS1/LS7 spacer kit... it was the final piece of the puzzle... I needed new injectors, so I decided to get LS7 injectors and will use the LS1/LS7 injectors adapters also from Katech...
![](http://s97997631.onlinehome.us/temp/roy/427roy.jpg)
A simmilar motor is going into my A4 98 Firebird next week... it will be a little more of a race setup so it will be interesting to see what kind of results I will get...
PS. Thanks to Jason @ Katech for rushing me out LS1/LS7 spacer kit... it was the final piece of the puzzle... I needed new injectors, so I decided to get LS7 injectors and will use the LS1/LS7 injectors adapters also from Katech...
![](http://s97997631.onlinehome.us/temp/roy/427roy.jpg)
#16
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Originally Posted by vmax1500
I don't know the cam specs... but I do know that this is somewhat of an experimental setup as it's the 1st build that I know of based on the ETP LS7 head... it's safe to say that my engine builder (the same who built my buddies engine) has just got started with this...
When you say 1.25 X displacment in torque, is that based on the numbers at the crank?
When you say 1.25 X displacment in torque, is that based on the numbers at the crank?
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Originally Posted by David Gordon
If his heads flow so well do you think maybe they cost him low end torque? Or would too big of cam or too much LS do this. I made 470 rwtq out of my 395 cu". Just wandering I am about to start another motor and just seeing what everyones vuse are.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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Originally Posted by Patrick G
No, better heads will enhance cylinder filling, making it easier to achieve 1.25xCID in torque. He just has some mis-matched parts right now. Once it's all sorted out, you will see some amazing(er) numbers! ![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
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Originally Posted by DavidNJ
For an engine which doesn't 'come on the cam' until 4700, is weak down low,and has an unrestricted intake, it seems to run out of breath rather early.
What is the bore and stroke?
What is the bore and stroke?