View Poll Results: Cam for my LS3 build 418CI TSP
243/252 .653-.627 110-113
1
10.00%
240/250 .625-.630 112
2
20.00%
245/252 .640- .650 112
3
30.00%
None of the above and I posted my suggestion below
4
40.00%
Voters: 10. You may not vote on this poll
HELP me decide on a cam for my LS3
HELP me decide on a cam for my LS3 Looking at building a LS3 418 from TSP.
LS3 block
Compstar 4.00 inch stroke
Eagle 6.125 H-beam rods
Wiseco forged pistons 4.080 bore with -4cc valve reliefs
TSP CNC ported LS3 heads 2.165in/ 1.60ex valves
66cc chambers
.040" Cosmetic gasket
should be around 11.9 to 1 comp ratio
FAST 102/102mm ported intake
Nitrous plate up to a 200 wet shot with dedicated fuel system
This will be mostly a NA running drag car F-body, but run the juice for the number, about 3400# with driver, stick car. All supporting suspension, tranny, 12-bolt, 28" ET drages, etc mods
either running a 4:30 gear or 4:56 gear in the rear.
I love to make 550+RWHP NA
All inputs welcomed, I have been doing tons of reading and I am sending Pat G my request as well.
Thanks a whole bunch!!!! Art
LS3 block
Compstar 4.00 inch stroke
Eagle 6.125 H-beam rods
Wiseco forged pistons 4.080 bore with -4cc valve reliefs
TSP CNC ported LS3 heads 2.165in/ 1.60ex valves
66cc chambers
.040" Cosmetic gasket
should be around 11.9 to 1 comp ratio
FAST 102/102mm ported intake
Nitrous plate up to a 200 wet shot with dedicated fuel system
This will be mostly a NA running drag car F-body, but run the juice for the number, about 3400# with driver, stick car. All supporting suspension, tranny, 12-bolt, 28" ET drages, etc mods
either running a 4:30 gear or 4:56 gear in the rear.
I love to make 550+RWHP NA
All inputs welcomed, I have been doing tons of reading and I am sending Pat G my request as well.
Thanks a whole bunch!!!! Art
Last edited by 4U2NV-SS; May 24, 2010 at 11:11 PM.
Do you know if Shawn at VA will spec out a cam without having to buy it from him?
I cant recall seeing any cams like those on big hp LS3 ( L92 ) head builds. More lobe sep and more lift/less duration would be more the norm.
But Im more curious about what PatG comes up with
But Im more curious about what PatG comes up with
Why would you do that?? Unless you have an inside track on having a cam ground for wholesale, the price for buying a cam from Shawn is not hardly any different than from someone else. Price should be within a few dollars.
I have no dog in this hunt, I was just wondering.
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Why would you do that?? Unless you have an inside track on having a cam ground for wholesale, the price for buying a cam from Shawn is not hardly any different than from someone else. Price should be within a few dollars.
I have no dog in this hunt, I was just wondering.
I have no dog in this hunt, I was just wondering.
I don't mind paying him for his suggestions too. But I am getting a little better deal on the cam. I think he wants like $500 for his spec'd cams.
Just trying to save a my pennies...
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Why go cheap on the brain of your engine? You have your goals and have spent a lot of money thus far. Get a cam specced by a professional who does this for a living. A $100 extra for a cam that works as designed the first time is better than having to buy 2-3 cams and you may never get it right. Geoff @ EPS and Shawn @ VA speed are the only two sponsors on this site I will recommend to you. 23x/24x 11x 650 + lift something like that, as stated earlier all those current cams have too much intake duration. LS3 heads have a much bigger intake valve than a standard LS1 head therefore you will need more lift to achieve best results. If the heads have a proper valve job they will have no problem taking advantage of the higher lift. If you do not have a proper valve job the heads may go turbulent above a certain lift and not help.
Here is a quote from Bret
The intake side usually needs more lift, but most importantly it has more valve size. That relates to something we call L/D ratio, or lift to diameter... basically a valve while it is opening is a restriction to itself up until 25% lift of it's diameter. So a 2.000" valve is a restriction till .500" lift, you can do some fancy calculations playing with curtain area to prove this situation to yourself if you want... but it's a pretty commonly accepted idea.
Here is a quote from Bret
The intake side usually needs more lift, but most importantly it has more valve size. That relates to something we call L/D ratio, or lift to diameter... basically a valve while it is opening is a restriction to itself up until 25% lift of it's diameter. So a 2.000" valve is a restriction till .500" lift, you can do some fancy calculations playing with curtain area to prove this situation to yourself if you want... but it's a pretty commonly accepted idea.
Why go cheap on the brain of your engine? You have your goals and have spent a lot of money thus far. Get a cam specced by a professional who does this for a living. A $100 extra for a cam that works as designed the first time is better than having to buy 2-3 cams and you may never get it right. Geoff @ EPS and Shawn @ VA speed are the only two sponsors on this site I will recommend to you. 23x/24x 11x 650 + lift something like that, as stated earlier all those current cams have too much intake duration. LS3 heads have a much bigger intake valve than a standard LS1 head therefore you will need more lift to achieve best results. If the heads have a proper valve job they will have no problem taking advantage of the higher lift. If you do not have a proper valve job the heads may go turbulent above a certain lift and not help.
Here is a quote from Bret
The intake side usually needs more lift, but most importantly it has more valve size. That relates to something we call L/D ratio, or lift to diameter... basically a valve while it is opening is a restriction to itself up until 25% lift of it's diameter. So a 2.000" valve is a restriction till .500" lift, you can do some fancy calculations playing with curtain area to prove this situation to yourself if you want... but it's a pretty commonly accepted idea.
Here is a quote from Bret
The intake side usually needs more lift, but most importantly it has more valve size. That relates to something we call L/D ratio, or lift to diameter... basically a valve while it is opening is a restriction to itself up until 25% lift of it's diameter. So a 2.000" valve is a restriction till .500" lift, you can do some fancy calculations playing with curtain area to prove this situation to yourself if you want... but it's a pretty commonly accepted idea.
So I am leaning more towards a 236/245 .650-.630 112.....
Good luck ! 
There are a hell of a lot more to cams than .050" duration numbers and max lift. Keep in mind some people have played around with what ramp rates work with these big intake valves. You will not be able to just pick some lobe that offers 23x duration @ .050 with .650" and just call it a day. The most important thing to selecting the proper cam specs is valvetrain stability. Just because an LSK lobe is around .650" lift does not mean thats the lobe to run at all. Some lobes are not even in a comp catalog under the LSx category, hell some cams don't even run comp lobes because they do not offer what is needed for the setup. But hey if you trust John Doe off the net to spec your high $$$ setup, than more power to ya.
There are a hell of a lot more to cams than .050" duration numbers and max lift. Keep in mind some people have played around with what ramp rates work with these big intake valves. You will not be able to just pick some lobe that offers 23x duration @ .050 with .650" and just call it a day. The most important thing to selecting the proper cam specs is valvetrain stability. Just because an LSK lobe is around .650" lift does not mean thats the lobe to run at all. Some lobes are not even in a comp catalog under the LSx category, hell some cams don't even run comp lobes because they do not offer what is needed for the setup. But hey if you trust John Doe off the net to spec your high $$$ setup, than more power to ya. Last edited by Nitroused383; May 25, 2010 at 04:29 PM.
Yeah thanks for your input!!! that is what I am asking for is everyone knowledge!!! I wamy waiting for Pat G to get back to me. I will try to talk to Shawn and see what he can help me out with. I think those guys can point me in the right direction.
+1 on a custom grind cam. off the shelf cams are great but since you have some specific goals for yor car maybe you should consider specific parts and not jsut any ol big grind cam
