There is so little difference between the two cams you might as well get what you can get cheapest- the LS9, which can be had for around $100

 

do you think that cam will be better with a dual plane or single plane intake?

 

Not sure I am qualified to answer that. Just figure it has a HUGE split, like it's 211/230 on the duration, plus a HUGE LSA, 122.5 deg. It WILL NOT LOPE. Your manifold gurus will be able to give you a good answer on that.

 

Hi 74, the LS Firing Order was created, changed from 18436572, to work better when a Single Plane intake was fitted. (18726543)

Your Hendrick head works well with WIDE C/L camshafts.
Your C.R. of 11.3 works well with WIDE C/L camshafts.

My choice would be the LS-7 "late" camshaft.

I can provide the GMPP (Wegner + PML) intake AND a Holley Three BBL carb ?

Lance

 

Both of those camsahfts have a very late intake valve close event. So, in naturally aspirated 5.7-6.2 liter engines, they are going to have very poor torque and what to see a lot of RPM to perform well. Because of that, the dual plane manifold will perform much better below 7000 RPM.

One thing you can do to make that camshaft perform notably better would be to advance it 4 degrees.

 

I read somewhere that smaller ls1 cams work great on ls3 heads......bigger is not always better, if that's the case that would be awsome cause I can still run original cam sensor in the rear....is this true? 214/230 .601"/.578" on 117 lsa comp cam anybody run this in a lq9 on rectangle port heads? Will it work with 11.2:1 compression

 

If you want a real cam recommendation, list everything about your build.

Vehicle
Vehicle weight
Engine size and type
Bore & Stroke
Compression ratio
Cylinder head model
Valve sizes and flow numbers if available
Intake manifold model
Exhaust system details - header size, full exhaust, race exhaust etc
Hydraulic or solid roller desired?
What rocker arm ratio?
What model lifter?
Do you already have valve springs? If so, what part number or specs?
Transmission
If auto, what RPM stall torque converter
Rear gear
tire height
How do you use the vehicle? Daily, weekend toy, street/strip, roll race, 1/2 mile, road course etc
What idle and drivability characteristics do you want?

 

Yea I should have took alot of these questions in mind before coming to a cam conclusion. ...with that being said I can maybe honestly answer half of them. ....I don't have a planned vehicle for it it was mainly a backup motor for when the 5.3 goes in my 74 nova th350 3000rpm stall. Freeway gear at the moment. ...but these 5.3s last a while and I'm happy with the 400hp from it.....so I might consider swapping into a box c-10 or suburban k5. Possibly older gen c 10 like 67/72. I miss my 72 long bed c10. Had kids. Wife wanted more doors and cleaner emissions so had to get a duramax lol but I want a c 10 to restore with my son cause I don't wanna give him the nova he is 10 now. So Yea it would have to be reliable and daily driven....

 

Back in the day, I did not care for the 67-72 trucks, now I am sweet on them. Maybe my tastes are "maturing". LOL

 

Speedtigger- Not to hijack this thread, but you mentioned advancing the LS9/LS7 cam 4 degrees to improve performance. With that done, how much power improvement would you see this cam giving an otherwise stock LS3? I know, there are FAR better cams... This is hypothetical.

 

I was kinda thinking the same thing. .....also I was told that ptv issues arrive when you mess with the degrees. .....I'm gonna go with a 224/.560 on a 112 with single plane efi manifold with throttle body elbow. ......370" 11.2:1 compression rectangle port heads

 

I am also interested in Speedtigger's comment on the 4 degree cam change. Since I have a stock LS3 with GM single plane intake and a LS7 cam. I am buying a new timing set I guess using one that I can advance or retard the cam would make sense. Do you know anyone that has run their cam advanced? Did it make more power?

 

What got my attention was that advancing it 4 degrees would make it NOTABLY (my caps) better. I guess we're all wondering, HOW notably? I doubt it will be earth-shaking, but when you can get the LS9 for about $150 new, bang-for-the-buck goes up NOTABLY too! lol

 

Does anyone have dyno numbers on an otherwise stock LS3 with a 4-degree-advanced LS9 cam? I am VERY curious.
Unless Speedtigger comes along and can give a highly-educated guess on this.... if so, thanks in advance!

 

do you already have ls3 cam? Is a ls9 cam that much cheaper than a stock ls3 cam?in one of my books Richard holdner pulled 497hp out of stock ls3 with the stock 400hp spec.cam....all just by fine tuning. ....so yeah is a ls9 cam really gonna do much better for d/d. $4$

 

opps meant to say 430hp

 

It would be a guess for sure. I would guess about 10 HP advantage for the LS9 cam.

 

Whoa. Not much! Even WITH the 4 degree advance? Gotta be next to nothing without it.....

 

I have seen several dyno posts on various Corvette sites where LS3s were dynoed with stock cam and then the LS7 cam. All of them picked up more than 20HP increase rear wheel HP.