Check out the July issue of Car Craft as they tested all the factory GM cams
in a 5.3 engine where the 01-04 LS1/LQ9 cam only gave up 8 ft/lbs @ 2500
and gained a bunch from there on up. The LS 2,3,6,7 and 9 all seemed to
give up quite alot until 4500 and then pick up from there. The LSA cam did
pretty well also. Lastly they tested a couple of the new Crane cams designed
to work with the factory behive springs IIRC the 200 deg./.502" pulled the
most vacuum, cylinder pressure, lost nothing at 2500 and gained 40 ponies
at 6500. Not trying to talk you outta your idea just offering alternatives......

 

Millions of comedians out of work and.........................

 

thanks!!

 

SO do ANY of the cams listed in here have a stock idle?

 

I've wondered the same thing fastfat..... except I would like to put it in a lq4 in my 2500hd. Ls6's are solid performers as you can tell by my sig. I see know reason a 6.0 would not do well with one advanced for some more bottom end of the clearance allows.

Combined with some 1.8 role rockers my 5.7ls6 makes 350lbft at 3500 rpm at the rear wheels

 

I agree, the problem is the peak power/torque is moved so far up it's useless in a truck. Advancing a cam will bring the power down.

My 92 Silverado made 220/310 to the wheels with a 5 speed, it was out of steam by 4500 rpm but it towed BETTER than a 5.3 auto truck does. I want the 5.3 I am about to buy to tow like my 92 Silverado did. This is what I'm after.

 

I don't think a 5.3 will make the kinda tq a old school engine does down low. It's just what happens with a smaller engine and better heads. It takes rpm to make it work.

Hers'a dyno sheet of my ls6. Did a before and after on a 1.8 rocker swap. The rockers did pretty good across the board. I have also thought about doing the 1.85 rockers on my 6.0 after seeing the tq that the 1.8's put in my ls6.



Idk how much advancing the cam would bring the power down in a smaller engine. I shift about 6800.

 

I am familiar with what a LS6 engine will do, here is mine in my 99 Z28.

Stock with headers and a lid.




Surely someone has done this already.

 

The reason your old engine made torque and died off fast was the combo of extremely long runners in the intake manifold and really really small CSA heads. Both of those choked the **** out of it.

 

That is what I was referring to.

A stock idle is obtained by keeping the overlap low, your best bet is to increase the lift and take advantage of the better flowing heads.


Exactly and the reason it died up top, not sure of the cam specs but I'm sure it's smaller than the 190/191 114 cam in the 5.3.
I'm sure you've heard the saying before, there is no replacement for displacement...2-3 degrees advancement is going to move the rpm range down 200-300 rpm, notice aftermarket cams have a max advance of 5* as any more and you should choose different cam specs that doesn't require advancing more than that.

 

Stock like idle:
Cam Motion #640, 672, 609 (206/212 112lsa, 113lsa, 114lsa +4).
Comp Cams #54-408-11(206/212 112lsa).
Crane #1449041 (210/218 114lsa).
Howards Cams #190315-14 (210/214 114lsa).

 

Bringing this up. I've got an 02 s10 blazer, L33 5.3L and LS6 cam. You're definitely going to have to do something to the cam if you want to tow. I can't even get my setup to turn the tires over. Just started googling cam timing adjusting and ran across this thread.

I'm afraid to turn the L33 any higher as I want it to last, power doesn't come on till about 4500-5000 and I'm shifting @ 5800. LS6s peak hp is 6k..

It's a complete dog out of the hole. I can stand on the gas and it does nothing. I do have 275 40 17 tires, but hell, that shouldn't matter.. I'm sure I'll blow the trans stalling it for too long before I could even get any tire smoke out of it.

*EDIT*.. here's it in action, I go WOT about 34 seconds into the video. Listen to it as it builds up then lets loose like there's a turbo spooling up. It's great for 55mph+ fun, but stoplights or putting a trailer on it? Forget it..

https://docs.google.com/file/d/0B8kv...it?usp=sharing

 

Yeah, the ls6 cam is the wrong cam for a 5.3 and towing. Go with a 212 or less for the intake lobes, and under 220 for the exhaust lobes and keep the LSA to 114 or less.
BTW, if you put a adjustable cam timing gears on your 5.3 you could advance you ls6 cam 4-5 degree's, that would move the power band down lower in the rpm range and the increase in dcr would make better power to. This would be an improvement but still not ideal.

 

ls6's peak about 6400. I shift about 6800 (limiter @ 7000)because it carries the power well. You should really turn the 5.3 harder. You're not taking advantage of that cam at all. Don't be skeered....turn that bitch.

 

IMO, it's just the wrong cam for his intended use in his 5.3 S10 blazer, plus I believe he still running the truck intake manifold.

 

Has the truck been tuned? You would be amazed at the low end grunt you can get by reworking the timing table, ditching burst knock and other TM nannies, and leaning it out some. And that's still on 87 octane. Fuel mileage also went up.

An ls6 cam is the last thing I would want for a towing truck.

 

Here is the dyno sheet on my LS6 in my Z28, it's making 300lb ft of torque at 2000 rpm.

I figured with the longer intake runners on the truck intake and advancing the cam a few degrees it would work good.

 

What gear is in the rear?

 

I do have the truck intake, stock maf w/ screen, stock TB. Have shorty 1 5/8" swap headers w/ 2 1/2" collectors. Goes "duals" through high flow cats into a 2-in-1 out 50 series big block flowmaster, then 3" out to the rear.

It has a 8.5" rear w/ 3.42s and G80 diff, 4L60-E built with red alto clutches, wide 2-4 band, billet servos, new solenoids, drilled seperator plate, etc... I have a truetrac sitting on my bench to go in it, but honestly have no need for it at this point the way it's running.

Using LS1edit (don't ask, please don't rim) and am trying to figure out the tune. Getting driveability to decent ltft then going to work on wot. Right now it's hitting 11.X:1 going wot w/ + ltfts. Have an Innovate LM-1 w/ rpm coverter wideband setup installed.

Started life w/ an 02 L59, using it's wiring harness, intake, injectors, but have 06 L33 longblock w/ 63k on it's clock. I lapped the valves, resealed it, and installed the LS6 cam, springs, and new lifters/trays. The engine was a warranty take out w/ lifter eating #3 intake lobe.





Watching the datalogs, I'm getting 24 degrees advance when I "line lock" it, afr is in the 11s, I know way rich, but even then it should have enough *** to turn the tires over. They're Cooper Zeon RS3-As, 275/40/17. Using a rebuilt S10 torque converter (ran out of truck fund) and it's stalling right around 2200 rpm.

 

I had friend he had the same problem. He did something with trans.part of the programing. Know it runs great.