LS6 500-515 HP build, Texas Speed Advise?
05-29-2013, 12:35 AM
#1
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LS6 500-515 HP build, Texas Speed Advise? I've a 2005 LS6 engine for the last 7 years, and year after year GM keeps upping the hp of their new motors from the LS2 to LS3 to the LS7 which is one monster motor and if I had 15 grand laying around I would pick one up in a heart beat.
My goal is to take my LS6 to around 500 HP or a little over. I will be keeping the stock lS6 heads.
What Im looking for is a good Cam/Spring combination to get me that exta 40-50 HP. I know Texas Speed has a lot of good combinations, and there were a lot of good thread back in the day on doing this but I can't seem to find them, espicially with dyno numbers to back them up.
Like I said I have the stock LS6 cam in there now which is .550 lift at valve intake and exhaust. Im looking for a STREETABLE CAM, something that idles similar to the LS6 cam but with the higher lift for the extra horse power.
I would also be going with the Behive springs.
Guys who have done the swap let me know how you made out on HP and the streetability factor. Along with the cam and spring combo I have a t-56 so a converter is a non factor.
Texas Speed I hope you chime in on the thread to offer suggestions for what Im looking for.
Thanks
Steve
My goal is to take my LS6 to around 500 HP or a little over. I will be keeping the stock lS6 heads.
What Im looking for is a good Cam/Spring combination to get me that exta 40-50 HP. I know Texas Speed has a lot of good combinations, and there were a lot of good thread back in the day on doing this but I can't seem to find them, espicially with dyno numbers to back them up.
Like I said I have the stock LS6 cam in there now which is .550 lift at valve intake and exhaust. Im looking for a STREETABLE CAM, something that idles similar to the LS6 cam but with the higher lift for the extra horse power.
I would also be going with the Behive springs.
Guys who have done the swap let me know how you made out on HP and the streetability factor. Along with the cam and spring combo I have a t-56 so a converter is a non factor.
Texas Speed I hope you chime in on the thread to offer suggestions for what Im looking for.
Thanks
Steve
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05-29-2013, 10:08 AM
#9
TECH Fanatic
I have been doing some research on my built. I found a 434 cubic inch forged rotating assembly for an LS6. Its a 4.00 bore and a 4.155 stroke for like $2300, Darton sleeves $1300, get the head machined by AI $1200+/- depending on options, and a decent cam... That would get you to 500 pretty easy. But that's also like $5k just in parts.
05-29-2013, 10:31 AM
#10
You need a bigger motor to accomplish what you want to do. The old saying of there is no replacement for displacement is gospel to say the least. That is the easiest way to get 500 RWHP. No matter how you get there is is not going to be cheep to do. Good luck to ya and please move offf of fantasy island....
PS I suggest that you call Texas Speed, Vengeance Racing, or any other of our long time sponsors and ask them what it takes in parts and $$$$$ to reach your goal. You will not be a fantasy island dweller after that conversation takes place.
PS I suggest that you call Texas Speed, Vengeance Racing, or any other of our long time sponsors and ask them what it takes in parts and $$$$$ to reach your goal. You will not be a fantasy island dweller after that conversation takes place.
05-29-2013, 11:14 AM
#11
^^ a bigger motor or a bigger budget. 500hp has been done before on a 347 but you can't rely on displacement - everything in the motor needs to be optimized.
i can add from personal experience that you're going to be damn close to your 15k mark when you're done picking all your components and getting the machine work done. and that's assuming you're doing the assembly work yourself. you might be better off saving up a little longer and buying an ls7.
or just buy a procharger and call it a day.
i can add from personal experience that you're going to be damn close to your 15k mark when you're done picking all your components and getting the machine work done. and that's assuming you're doing the assembly work yourself. you might be better off saving up a little longer and buying an ls7.
or just buy a procharger and call it a day.
05-29-2013, 12:08 PM
#12
When reading the OP carefully, its obvious they're talking about flywheel hp.
Now that is out of the way, 500 FLYWHEEL hp is no problem with a 346ci ls6, but a stock-like exhaust note will be compromised for sure. You'll need to massage the stock ls6 heads with a good port job. Approximately 500 hp is achievable with nearly stock driveability and a "monster" cam is not needed. Be very careful and do a lot of homework with your cam selection, and DO NOT use a cam which utilizes very aggressive lobes such as Comp cam's LSK lobes. Your valvetrain longevity will be tossed straight out the window with such lobes.
As mentioned before, maybe consider a supercharger setup. Its the absolute very best option for power/torque increase while keeping stock driveability. You will very easily be able to achieve 500 hp with very little boost and you'll keep the longevity of a stock engine.
Now that is out of the way, 500 FLYWHEEL hp is no problem with a 346ci ls6, but a stock-like exhaust note will be compromised for sure. You'll need to massage the stock ls6 heads with a good port job. Approximately 500 hp is achievable with nearly stock driveability and a "monster" cam is not needed. Be very careful and do a lot of homework with your cam selection, and DO NOT use a cam which utilizes very aggressive lobes such as Comp cam's LSK lobes. Your valvetrain longevity will be tossed straight out the window with such lobes.
As mentioned before, maybe consider a supercharger setup. Its the absolute very best option for power/torque increase while keeping stock driveability. You will very easily be able to achieve 500 hp with very little boost and you'll keep the longevity of a stock engine.
Last edited by R6cowboy; 05-29-2013 at 12:14 PM.
05-29-2013, 01:24 PM
#14
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Matter of Fact is is the 05 CTS-V LS6.
The engine is already pushing around 430hp and it is a very streetable motor. I thought I remembered a thread a number of years ago that a member got close to 500 with an adition of a cam and springs. I know thats asking a lot from a cam but its not like the heads don't flow.
And yes Im talking about the flywheel, not RWHP.
The engine is already pushing around 430hp and it is a very streetable motor. I thought I remembered a thread a number of years ago that a member got close to 500 with an adition of a cam and springs. I know thats asking a lot from a cam but its not like the heads don't flow.
And yes Im talking about the flywheel, not RWHP.
05-29-2013, 02:42 PM
#16
Matter of Fact is is the 05 CTS-V LS6.
The engine is already pushing around 430hp and it is a very streetable motor. I thought I remembered a thread a number of years ago that a member got close to 500 with an adition of a cam and springs. I know thats asking a lot from a cam but its not like the heads don't flow.
And yes Im talking about the flywheel, not RWHP.
The engine is already pushing around 430hp and it is a very streetable motor. I thought I remembered a thread a number of years ago that a member got close to 500 with an adition of a cam and springs. I know thats asking a lot from a cam but its not like the heads don't flow.
And yes Im talking about the flywheel, not RWHP.
I would think an LSL/LXL lobe combo would probably work pretty well for you.
05-29-2013, 04:23 PM
#17
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Thanks Ill look into that cam. Whats the lift? Do you know off hand? What was the LSA on it? 112 or 114?
Last edited by Steve83ta; 05-29-2013 at 04:47 PM.
05-29-2013, 04:39 PM
#18
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When reading the OP carefully, its obvious they're talking about flywheel hp.
Now that is out of the way, 500 FLYWHEEL hp is no problem with a 346ci ls6, but a stock-like exhaust note will be compromised for sure. You'll need to massage the stock ls6 heads with a good port job. Approximately 500 hp is achievable with nearly stock driveability and a "monster" cam is not needed. Be very careful and do a lot of homework with your cam selection, and DO NOT use a cam which utilizes very aggressive lobes such as Comp cam's LSK lobes. Your valvetrain longevity will be tossed straight out the window with such lobes.
As mentioned before, maybe consider a supercharger setup. Its the absolute very best option for power/torque increase while keeping stock driveability. You will very easily be able to achieve 500 hp with very little boost and you'll keep the longevity of a stock engine.
Now that is out of the way, 500 FLYWHEEL hp is no problem with a 346ci ls6, but a stock-like exhaust note will be compromised for sure. You'll need to massage the stock ls6 heads with a good port job. Approximately 500 hp is achievable with nearly stock driveability and a "monster" cam is not needed. Be very careful and do a lot of homework with your cam selection, and DO NOT use a cam which utilizes very aggressive lobes such as Comp cam's LSK lobes. Your valvetrain longevity will be tossed straight out the window with such lobes.
As mentioned before, maybe consider a supercharger setup. Its the absolute very best option for power/torque increase while keeping stock driveability. You will very easily be able to achieve 500 hp with very little boost and you'll keep the longevity of a stock engine.
05-29-2013, 04:50 PM
#19
Them LS6 heads flow alright stock but nothing amazing. If you won't be using a supercharger, you will want to get the heads cnc ported to get as much perforamnce as you can out of them since you want longevity out of your cam and valvetrain (keep the stock lightweight valves btw) and reach your ~500 hp goal. Porting the heads will mean you'll need less cam to reach your goal, and less cam equals longer valvetrain life. Cnc porting the heads will be well worth it in the long run.
05-29-2013, 04:58 PM
#20
TECH Fanatic
I looked into getting my LS6 heads ported by AI... I have an 04 V. They do a basic head port for like $795... And a full head port for like 995... Plus you can have all sorts of options like having them put valves and springs in the head... And they will even spec a cam for you if you want to match the head with the proper cam. I am seriously contemplating sending my heads out for porting. I just don't have a daily driver.
http://www.advancedinduction.com/LSX/AiLSxCylinderHeads.php
http://www.advancedinduction.com/LSX/AiLSxCylinderHeads.php