Why 6.0s are so thirsty?
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.
If it were wrung out and fully tuned youd see much more difference.
Thread Starter
TECH Veteran
Joined: Sep 2014
Posts: 4,893
Likes: 706
From: Mississippi
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.
TECH Senior Member
Joined: Jun 2016
Posts: 22,303
Likes: 3,619
From: Central Cal.
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.
He was chasing a frog. I had no issues. That was 3 years ago. That is the heaviest ive hauled in quite some time but i have hauled more with that truck and trailer combo. The 5spd manual is by far the best for heavy loads but the single cab sucks for it so its a trade off.
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...
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo 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.
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.
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
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.
~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.
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.
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.
Thread Starter
TECH Veteran
Joined: Sep 2014
Posts: 4,893
Likes: 706
From: Mississippi
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...
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...
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
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.
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.
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
Cam would be very efficient with good tune.
That sounds/looks like a good combo, where are the peaks?
Should sip gas at cruise.
Thread Starter
TECH Veteran
Joined: Sep 2014
Posts: 4,893
Likes: 706
From: Mississippi
Dan... I remember writing the recipe down awhile back. Can't remember the peaks. Richard later put a turbo on this motor....
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.
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
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.
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.
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.
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.
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.
Maybe they are upgraded to trunions now but still stock rockers on +600 lift on DD cars.