reddragon71

Hi guys, im in the process of a winter build on my camaro, it was previously a stock bottom end cam only car with a little spray. I am upgrading to a forged 11:1 347 ls1 with
heavily ported heads 799/243
Port matched super victor
edelbrock low pro elbow and 90mm tb
n20 outlet stinger plate (spraying 200-250-300)
Th350 with a brake and custom ptc 4000 converter to spec
3400lbs
1/4mi car that is regularly street driven and raced but sees a lot of track time
I like to play with the car on the street on motor but any major racing will be done on spray most likely (possibly with smaller shots at times but no more than 300 ever)
(If there is any more info needed let me know)


I have had 2 cams spec'd for this setup
1. 234/246;.629/.629 114+2
2. 235/246 .62x/.595 109+6

Now my question is which cam setup would be better for my setup, I like a choppy idle but im not qujte willing to sacrifice performance for it...and with more advance and a lower lsa on cam 2 would that combined with the lower exhaust lift provide a better series of valve events for my setup vs #1? Any help is thanks!

HCI2000SS

iTrader: (2)

I'm thinking the first cam might do a little better on the nitrous due to the wider LSA

red fury

iTrader: (1)

I agree, first cam. Not sure if it will be optimal once you start hitting it with 250+ though.

speedtigger

iTrader: (16)

Those are two drastically different intake centerlines. One on 103 and one on 112. Wow. Is there any chance you don't have the advance figures swapped by mistake?

StrokerTA

I'd rather see something early .240's and late .250's on a 114...

87silverbullet

iTrader: (11)

Forget the cam choice. I wouldnt use an elbow on a carb style intake unless I'm doing FI.

reddragon71

I just checked and cam 2 was 109+5 and not 109+6....cam 1 said it was a toss up for +2 or +4 on the 114.....and thanks for the elbow comment, definitely havent heard that one before. ..

speedtigger

iTrader: (16)

Then I would say cam #2 for sure. That 1st cam has typical plastic intake specs. The 2nd cam looks like a Martin or a Brian flava.

RobsZ28

iTrader: (3)

I have a simliar engine combo as the OP. Here are my specs.

347ci LS1 forged bottom end
11.1 comp.
Eagle forged 6.125" H-beam rods
Wiseco Flat top forged pistons +3.2cc valve relief
Edelbrock Super Victor intake
4150 accufab T/b
TEA Stage @ LS6 heads 2.04/ 1.575 valves and .650" springs
1 7/8" headers w/ 3" true dual
4L60E 3600 stall nitrous converter
9" rear end 3.70 gears
250-300hp nitrous shot

I have 2 nitrous grinds spec's for my engine the 2nd should make more power everywhere and help the intake to work.
237/248 113+3
239/250 112+3

reddragon71

So you guys think the 109+5 would be more effictive than the 114 with my setup? And what do you rhink about the lower exhaust lift on cam 2? Would that be beneficial in some way?

87silverbullet

iTrader: (11)

There are many threads dating back to almost 10 years ago about guys removing elbows and putting 4 hole throttle bodies on and picking up between 25-40 hp depending on head and cam choice and cubes.

reddragon71

Again, im aware...this thread is about cam selection

StrokerTA

I run our stuff straight up, I don't find staggering lift numbers on this type of combo is going to help or hurt. I open the valve as much as possible, duration makes power.
I would run a 114 cam.

speedtigger

iTrader: (16)

Did you run a single plane intake on your nitrous motor?

StrokerTA

I've done a lil bit of everything, the WhiteLTone was a Super Vic.. I've done ls6 and ls2 manifolds the same way.

speedtigger

iTrader: (16)

The reason that I asked is because of the cams I see that cam shops have begun to recommend for the single plane builds are looking more like cam #2 in this thread, while cam #1 looks like your typical plastic intake cam. I wanted to see if you have tried the cams with the earlier events that a lot of the cam shops are moving toward for the single planes.

StrokerTA

I move the valve events around a little for the plastic intake stuff, but I just did a cam only ls2 car that made 430rwhp through an 4l60e. It is the same basic design I would use on a single plane, just tamed down a little... It's in my 610 lift family, not the 650 stuff.

reddragon71

Would you rather see just a 114 or a +2 or +4? And for what benefit, if any would either advances give? I appreciate the discussion so far!

RobsZ28

iTrader: (3)

The advance will help with low end power. Right now I have a cam in my car that has no advance and below 3000 rpm it's sluggish. The cam with no advance I feel would work better in a 6 speed car or an auto with a 4500+ stall. Where it can get to higher rpms quicker than a 3600 rpm stall car can.

StrokerTA

That's why you do a custom grind cam, you take that into account when making the camshaft so you don't need a 4500 stall to make it work..
If you advance the cam off of what it was ground on, your gaining somewhere, and sacrificing elsewhere..
You should not need to do that when getting a custom ground camshaft.