4U2NV-SS

iTrader: (21)

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

Jimbo'sZO6

iTrader: (1)

I would go with a custom cam from Patrick G. The man knows what works with the LS3 rectangle port heads.

WKMCD

iTrader: (2)

All of the above cams have way too much intake and are too big in general for a FAST intake.

Just my $.02 but what do I know.

4U2NV-SS

iTrader: (21)

By going to big, will that cause problems??? I just don;t want to be to small and have to do it again.

Do you know if Shawn at VA will spec out a cam without having to buy it from him?

cam

iTrader: (9)

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

4U2NV-SS

iTrader: (21)

Yeah I sent him a Payapl and filled out his form. Thanks for the help so far guys!

Stang's Bane

iTrader: (22)

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.

4U2NV-SS

iTrader: (21)

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...

Stang's Bane

iTrader: (22)

Understood.

Stang's Bane

iTrader: (22)

Would you consider running a single plane intake??

I think you could really pick up some time at the track with a single plane and a cam designed for it.

4U2NV-SS

iTrader: (21)

I looked into that too, I really do not want to cut the cowl area if I do not have to and I don't care for the look of the carb hats either. My opinion

Stang's Bane

iTrader: (22)

Completely understand.

IMO, if you don't want to run a carb style TB, you are better off staying with the stock style intake on a NA type deal.

4U2NV-SS

iTrader: (21)

So my understanding is that you do not need that much lift with these heads. So .640/.630 should work better?

Nitroused383

iTrader: (10)

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.

4U2NV-SS

iTrader: (21)

So I am leaning more towards a 236/245 .650-.630 112.....

Nitroused383

iTrader: (10)

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.

4U2NV-SS

iTrader: (21)

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.

Tainted

iTrader: (9)

+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

4U2NV-SS

iTrader: (21)

Thanks Pat G got back to me. We are very close