stevecritt

iTrader: (3)

Going with ported l92s stock lq9 and single plane probably 850 carb. What cam would you guys go with?

I've been looking at TSP's 231/236 .641/.617 I believe it is. Think this is adequate? Or am I leaveing a lot on the table? and should go with a custom cam? I don't know of any reputable custom cam grinders for ls motors. This is my first go at this.

00BlackSS

iTrader: (7)

well, from what ive seen, ported l92s on stock cube 6.0, they dont pick up that much but i went with the LG G6X3 cam. After talking to Lou two or three times, we cam up with the idea to do that cam but on a 109LSA to help with the vacuum.

ZONES89RS

iTrader: (25)

I would go with something that has a larger split. Something like 232/246 on a 108 LSA, .610ish lift. If you want a off the shelf cam for l92s, not happening for a carb really.

stevecritt

iTrader: (3)

well who is the best to go with?

orange88ls1s-dime

anyone who makes billet cams is gonna be good but since you are running a carb you cant use a cam with more than 108LSA or you wont pull a strong enough signal to have the carb function properly. I would get a cam around 0.610-0.625" lift 235ish degrees of duration @0.050" valve lift. depending on more street use go with 108LSA or more track use go 106LSA and just use a 750 ultra HP holley carb or equivalent. 850 might make more top end power but the 750 will be way more crisp on that engine, especially on the street.
just my 2 cents worth
Beaudacious

orange88ls1s-dime

varying the duration split on a NA motor you should limit yourself by about 10 degrees difference in to ex. if you where to have a devoted nitrous engine you could go maybe 15-20 degrees more ex but since the L92 heads are so efficient on the ex side i would run almost straight up duration to help dynamic compression a bit for more torque.

ZONES89RS

iTrader: (25)

Call Geoff at EPS, he knows his stuff and will custom grind a perfect cam. You want at least a 10* split with l92/ls3 heads.

Doug G

I went with a 110 LSA on a 106 ICL and a 10* duration split.

Block is at machine shop and can only go on the performance numbers I seen from the one I'm copying.

jgillen91

iTrader: (1)

i had pretty good luck with my eps cam from geoff 235/251* .624/.632 on a 110 lsa +4 advance

.030 over lq4 ported milled l92's, victor jr 850 carb

10.72 @126

BOBS99SS

iTrader: (2)

Your best bet is to talk to pat g or another sponser that knows what there talking about,that way you can go over your combo and pick out something that will be perfect

streetknight2

iTrader: (10)

Another vote for Geoff at EPS. Great guy to deal with.

stevecritt

iTrader: (3)

ok. Any body have a number or contact info on any of these guys? I def want to make the most out of the motor and be a street/strip.

ZONES89RS

iTrader: (25)

EPS

http://www.engpwrsys.com/

gsxkid

iTrader: (2)

I have had 4 cams in my car and i can tell you the ls3 heads i run need a BIG cam. i even had a custom patg cam. for your setup i would say something around 245/255 635/645 109 or 108 lobe sep

stevecritt

iTrader: (3)

can I even run that on a stock bottom end? what about ptvc?

wantsum410

iTrader: (5)

Go with Geoff @ EPS or Pat G. & SAVE YOURSELF ALOT OF HEADACHE !

speedtigger

iTrader: (16)

I see a lot of people mentioning the popular LS1Tech cam gurus. I am not sure some of them really have much experience on carbureted engines. After trying a couple cams and doing a ton of reading I have come to the conclusion that these motors start to behave more like the older engines when you put a single plane intake and carb on them. What I mean by this is I believe they favor narrower lobe centers and more advanced cam timing. I attribute this to the shorter runners in the single plane intake manifolds. The narrower lobe center increases the midrange signal to the carb due to scavenging and the increased advance compared to the long runner fuel injection intake matches the short runner intake better. I would also speculate that when you narrow the lobe centers and advance the cam, you might also want to go slightly bigger on the duration as both narrowing the lobe center and advancing the cam lowers the effective RPM range comparatively.

OP, how much converter are you running with your combo?

topbrent

iTrader: (1)

Or Ed Curtis, or Bret Bauer, or Bullet racing cams, or BES, or Darin Morgan at Reher-Morrison, ...just enlarge the list of cam spec dudes on there...

The cam in the OP's post would make for a fun car and make good power. However, what are you goals for it?

Nitrous or N/A?
Is this a dual purpose car?
What RPM range do you want power at?

Look at the posts by dmmizell, jgillen91, Burgers, 3pedals, iheartls1, and many others.
All of these guys are running very quick cars with intake duration under 239°.
All of these figures are for 6.0/6.2 L92 head combos.
All run at least 10.90's, with dmmizell running as quick as 9.80's.

Dmmizell: 2900lbs, 239/247@.050 110lsa+4, 9.87/137 - stock heads
87olds442: 3300lbs, 226/236@.050 110lsa, 10.79/121 stock ASA hot cam, LS376-515 crate engine.
Burgers: 3300lbs, 233/239 112lsa, 10.56/127, CNC TSP heads
IheartLS1: 3700lbs, 239/247@.050 110lsa+4, 10.77/125- stock shortblock, CFM ported heads.
Jgillen91: 3400lbs, 235/251@.050 110lsa+4 10.72/126, CFM ported heads
3pedals: 3425lbs, 236/262@.050 110lsa, , 10.90's@130 (still a new combo with lower et's in store) Stock heads.


Be careful not to get greedy and overcam your engine. With 260cc+ of intake port volume it is pretty easy to make a real dog of a car.

gsxkid

iTrader: (2)

i have delt with geoff and patg.my patg cam did ok but was alot less cam than my motor needed.i can tell you theres not alot of guys that have experience with the carb and ls3 heads.i have been through 4 cams with my 6.0 the last cam i got is 255/263 651/651 108 lobe sep.that cam run 2 tenths and 2 mph faster the the 1/8th not the 1/4.my patg cam was a torque monster 460whp and 475 whtq.its for sale too

235/243 .610”/.627” 110LSA +2 advance this was my patg cam specs

topbrent

iTrader: (1)

From looking through your other posts, aren't you running around 13.5 compression?

13.5 is around 3 full points of compression more than what most of the guys on this board run, and an engine built with that much compression will definitely require and tolerate a larger/different cam profile than something running 10:1