Tuskyz28

By looking at those 2 graphs posted... the aftermarket cam looks like it don't kick it really to 3000 rpm which is too late in the rpm band for a guy that actual tows.

tech@WS6store

iTrader: (2)

Larger ratio rocker does help but it wont add the @.006 and @.200 etc duration that a higher lift lobe would.
Iirc the issue with the xer style is low adv/.006 duration vs lift make for a more aggressive ramp rate when you are still trying to hit a higher lobe lift.
The HUC would be a better example imo. They are great lobes and quiet also. You may see an iteration of them on at least 2 or 3 other cams we are looking at designing.

That 218 high lift lobe has 3 extra degrees @.200 vs the low lift by itself. That helps. @.050 is compared so often but adv and @.200 matter alot. So does actual lobe centerline vs total duration with asymmetric lobes.

tech@WS6store

iTrader: (2)

The graphs are VERY deceiving. When it comes on you cant load the water brake much or itll bog it down then it comes on that why you see the bump. Also the timing is either not changed between the 2 or hardly changed and like i said afr is pretty rich. They seriously use HP Tuners and a stock ecm to tune and work with and make minimal tweaks between runs. Its a better picture of actual gains vs tuning magic, but there is ALOT left in the tune. On a chassis dyno it would show what you are used to, the huge jump in starting points on the graph. The water break can make or brake a dyno run really.
If it were wrung out and fully tuned youd see much more difference.

Tuskyz28

I know for a fact that a tune makes a BIG DIFFERENCE. I remember 6.0 hop ups in Hot Rod Magazine. Stage 3 consisted of GTO headers , flowmaster mufflers and a tune that worked on the fuel/timing tables. Motor made 410hp/440ft lbs at the crank.

G Atsma

Yeah I think there are a lot of folks that don't appreciate that fact. A tune on even a STOCK engine can net a good chunk of power because factory settings can be too conservative, like too retarded, too rich, etc. which costs power AND fuel economy.

tech@WS6store

iTrader: (2)

Ive personally seen 30/30 on a 99 high mileage 5.3. Gained even better than that tq in the lower end. 100% stock down to the Delco plugs in it.

G Atsma

^^^^^DEFINITELY worth it!!

CattleAc

iTrader: (7)

I'm just giving you a hard time...


I know a little bit about heavy payloads with a 6.0L also.


This...







Is in this...






I'm very interested in the camshaft discussion part of this thread. I'd like to get the optimum amount of torque out of this thing that I can before going to a stoker crank...

tech@WS6store

iTrader: (2)

I know.

As far as the cam part, the tsp lobes are better than most of the comps at the moment. Id shove about .615ish lift in there on some 243s and stay on a 112 or less lsa in the 108-109 icl and a 218 max intake and 220 max exhaust. After that the lower end starts to slide off.

Going to a 4.030 or 4.040 with a flat top will gain as well. 1 3/4 max on headers really. Going larger takes away bottom end. Keep exhaust velocity up with a smaller tube and have plenty of pulling power.

Really the trans part would help alot. 4l60 ratio in a nice hd rebuild would be better than a 4l80 comparing the 2.

NAVYBLUE210

My .02 for a truck/tow cam with the stock stroke & 243s
~212/214 .595"/.585" 112+3 goal to bring peak torque
Below 4000 & peak hp below 5500, LTs & Ported truck or
TBSS Intake & tune.

Darth's 4.00" Stroke in a small Bore 5.3 for a very "UNDER SQUARE"
360" would be an awesome tow engine with a little cam tweaking
With the above mods. Would probably be most fuel efficient combo
Torque peak below 3500 & hp below 5000, geared & trans for
Optimum Efficiency.

No personal experience, just theoretical lol.

tech@WS6store

iTrader: (2)

If you're doing such a long stroke then staying with a small bore seems backward. At least go .040 over which is a std oversize but a 3.898 would be good.
Ive seen lift pick up low range tq a good amt not just in lift alone but total lobe area. Dont be afraid of it.
Keep the runners long and youll be fine. I haven't been able to compare the 3 bolt truck intake to rhe tbss then vs the dorman, but i have a feeling the dorman may win due to the lack of a choke tube.
Cut those out of the reg truck intakes and ive heard they suffer. haven't seen that so cant weigh in.

Tuskyz28

Using a procomp 4" crank... making the 5.3 to a 383 ci.
Stock truck intake
6.0 heads
Long tube headers
212/218 cam
Results.... 455 hp/485ft lbs of torque
Motor​​​​​​ was in GMHTP years ago.... not sure how THIRSTY is would be at the gas pump tho...

NAVYBLUE210

Wouldn't >.600" lift with stock rr, with trunnion upgrade provide more
Long term reliability/spring life and a better wipe pattern.

Peak speed has some impressive Dynos and testimonials for their
Ported truck & TBSS intakes, don't know if they have ported Dorman.

Not opposed to overbore the 5.3, get the optimal piston &
Compression, but the STROKE is the key for off Idle &
Most efficient towing 2000-3500 RPM Hwy.

Tuskyz28

Cattle... I love that square body. The ultimate budget tow rig!!

NAVYBLUE210

Most dependent on gears,trans & right foot!
Cam would be very efficient with good tune.
That sounds/looks like a good combo, where are the peaks?
Should sip gas at cruise.

Tuskyz28

Dan... I remember writing the recipe down awhile back. Can't remember the peaks. Richard later put a turbo on this motor....

tech@WS6store

iTrader: (2)

No not really. There are heavily cammed cars out there running years on no upgraded trinion rockers well over .600 lift with 0 issues. Im not sure where all of that started but its not very concrete in the real world.
Ive seen quite a few 243 heads from ls2 engines with alot of guide wear. Engines were stock, but only noticeable when machine shop told me.

NAVYBLUE210

Plenty of reports here on fragged stock rockers with needle roller
Shrapnel through there engines & Oiling systems, not something
I would ever take a chance on.

Don't think there are many cars with .600+ lift & stock rockers running
12-15Kmiles/yr for many years with 0 issues, translated 50K Mile + daily
Drivers VS weekend toys 3-5Kmiles/yr 2-5 years 12-20K miles.

tech@WS6store

iTrader: (2)

They did it for how many yrs before the comp trunions came out? Ms3 cam ms4 torquer cams futral f14s the list goes on.
Maybe they are upgraded to trunions now but still stock rockers on +600 lift on DD cars.

Tuskyz28

Can you guys tell a difference in the gas milage from not running the a/c vs running the a/c ?