I have a 2006 EcSb silverado with the l33, does anyone have dyno numbers and or charts of it stock? How about with a cold air intake? Or with an exhaust? Or with a tune? Or with headers? Or with a cam? Or with comps 212/218 cam? Or with any combination of those. I have a cold air intake and the muffeler replaced with glass pack but that is how I wanna do my l33, dyno tune soon, cam, and headers. Thank you!

 

what heads and intake do you have?

 

L33s have 799 heads ( basically 243 heads without the sodium filled valves).
I'm betting he has the stock truck intake .

The L33 is a kickass engine to mod , they have great heads and flat top pistons ,

With bolt ons / tune I see no reason it won't 330+ at the wheels , put some forced induction on and make serious power with it .

I have one on an engine stand waiting for an old nova I bought .

 

L33 uses the same gen3 truck intake as a LM7/LR4

 

It actually has the 243 heads. Are they better or worse? It has the truck intake, but its drive by wire so its kinda hard to get a new intake manifold. I've been wanting to get it dynod and dyno tuned I've just gotta save up money. I don't know if I wanna get long tube headers or tuned. I asked the guy if he could change the wide open throttle shift point from 5500 to 6000 because when it shifts at 5500 it drops down to 3000 or whatever so if it shifts at 6000 it would drop down to 3500 where there's a lot more power. Does that make sense? Since its the l33 with more compression I should see better gains from mods such as a cam and headers over the other 5.3s right? I've been using superchevys modern mouse as my guide. Oh and I've been forgetting to mention my truck is stock with electric fans

 

243 heads and 799 heads are an identical casting. The difference is in the springs that come on corvettes etc. I'm surprised yours has the 243 though, however you don't have the upgraded springs that are typically on a 243 (at least I highly doubt you do).

Drive by wire is no biggie... you need a Dr. X to run a newer style TB and convert to an 87mm set up all together.

Where do you plan to have it tuned? Depending on if you get charged for every change made, I would do headers and have it tuned in one shot. Theres no sense in paying for a tune 2x.

As far as your shift points... raising 500 RPM wont make a 500RPM difference in the following gear. Think about it, 500 RPM in 1st gear is how much, 4 MPH? How much is 4mph in 2nd gear, 250 RPM? And your stock shift from 1st is set to 5600, so the difference is even less. Im not discounting what a hgiher shift point and a firmer shift can gain you, but dont expect the results you are thinking of. If you are looking for that type of action around shifts etc. you need a stall converter. Something mild like a TT3000 from Yank or a similar product from Circle D. Take it from someone who went through the process, an i6 converter isnt worth the price of an install. I had mine done free, and it was a great test for me, but if I could do it again I would have ponied up for $400 for the right converter.

The biggest advantage of higher compression is more low end power when you run a larger cam. The advantage of the heads is that they outflow the standard 5.3 heads by a huge margin, so they will support a lot more power as things progress.

 

How do I tell if I have the better springs? Ill take the valve covers off my truck tomorrow and check. Maybe my truck is some sort of experimental truck. The only problem with doing headers is then I have to run a new exhaust and relocate my cats and that fun stuff. If I had enough money i have a whole list of stuff I would do. My dream would be supercharger, cam, headers, dual exhaust, upgraded 6l80 trans and 4.10 gears. I'd be in heaven! But everyone's gotta dream. Hah

 

There were many L33's built with 243 heads, and some even came with one 799 and one 243. But none came with the better valves or valvesprings.

Now, it is possible that a previous owner of your engine has done some swapping....

 

Headers aren't as much of a pain as you think... they make direct bolt on long tubes. Where are you located? How do you have to pass emissions? I have no cats and I pass in MA...

 

I'm in NY. Its emissions through the computer and a visual inspection.