MOTRUBL

Well, I'm building my 408, and I just wanted to get everyone's opinion on camshafts. I'm building a 408 with LS6 stg 3's, running about 11.5:1 CR and I'd like to put on a 200-250 direct port N2O shot. My car is an M6 and I plan on installing 4.56 gears also. Any ideas??

Mike K.

My cam does pretty good on the nitrous but may not be aggressive enough for you

its a 244 248 .600 .600 114

Slowhawk

iTrader: (12)

Why would you want 4.56 gears I would be thinking 3.42 gears to use that power.

Anyway's-- Cam selection is based on what you are really looking for and the rpm range you want to stay in.Keep in mind you are talking HP but torque is what you are going to get.The 24+ cam listed is good.Also to get the most I would suggest a good stepped header like a Kook 1 7/8 stepped to 2.0 .

VINCE

iTrader: (1)

Call FMS and ask for a cam similar to mine, but with more duration and exhaust. With the gears you have you will be better off with a much bigger cam than mine. I have a 250/257 lsa 112 and I run 3.42's and with my light car they are pretty close to perfect. 3.73-3.90 would be totally perfect if I did not spray as much.

oufan2929

Speaking of spray, what do you dyno on the bottle? And with how big of shot?

VINCE

iTrader: (1)

I cant really give any true #'s. My damn pulley kept slipping. Put it this way.. I have seen 700rwhp on my first stage with a slipping pulley spraying a 175 dry shot at 4200rpm and 5 degree's of timing pulled out. So on motor I would be low 500's because of the timing and then comes the spray

777

iTrader: (21)

in other words...wait there aren't any

VINCE

iTrader: (1)

LOL!! If this pulley holds I will put the spray #'s in the sig.

sr71bbjr

iTrader: (52)

My 395 had a(hydrolic) 252 261 651 651 on a 115lsa and it did great.Most people dont have a big enough sack to run something like that though.LOL.I would go as big as You can on the header's like some others have said.Like 1 7/8 stepped to a 2in. with a 3 1/2 collector.Who ever dose your head work let them know that your running a 1 7/8
primary and to open the exit point of the exhuast port up for it.The main three tricks
to make good power on the hose is compretion, a strong exhuast slit on your heads
as well as your duration split on the cam,and of course a 114lsa or better.
main thig is to get the **** out of the motor.

kumar75150

i am going with something similar to what Vince and sr71 said

putting something around 250 260 in my 408

sr71bbjr

iTrader: (52)

no it was a hydrolic.It made only 450rwhp and 535 torque on motor,but thats with a t400 and a 4500 stall.The same tranny and converter robbed 70rwhp from my buddys car so I wasnt to upset.I'm selling my whole nitrous setup heads,cam the whole nine.

oufan2929

Hey Kumar, I'll have to come down there sometime to check out your car and maybe let you show me some of the street racing scene down there. I'm in Dallas every other month or so for whatever reason

sr71bbjr

iTrader: (52)

Kumar did you and sean ever get the HOse back on your car?Still happy that you went with a diffrent short?Sean told me that the 408 craps on the 395 through out the curv.

ForceFed HP

we will be using a 251/262 .651/.654 112LSA in our 408ci N2O setup.
it is a hydraulic roller cam. direct port dual stage N2O goin to 300 to 400 shot, race weight of about 2500lbs. should be wicked

VINCE

iTrader: (1)

Hell yeah that is going to be wicked Nice cam selection..

kumar75150

not yet man

i am ordering a bigger cam for the 408 and i gotta order some sort of progressive setup

kumar75150

the street race scene down here has been pretty dead for about 14 months now

Mike K.

damn all this talk of the big cams makes me want to take my pee wee 244 248 cam out and put in a monster, but for the 1st time in years the car is dare I say reliable so I'm gonna leave it as is for a bit but soon I do see a monster cam in my future.

kumar75150

that about the size of mine right now

244 250 on a 112

VINCE

iTrader: (1)

I made 563rwhp/518rwtq in my F-body with a 243/250 lsa 112 cam thru a 10 bolt and 3.73's. I honestly think since my current cam is bigger the C5 drivetrain robs horsepower because now I have 3.42's. It's either the drivetrain or my primaries from the Kooks being shorter than my custom FMS F-body headers. OR the fact only one cutout opened on FMS dyno when tuning the C5. TELLY!!!!