Any one know the cam specs for for 4.8/5.3 99 and 00+?

 

191/190 .457/.466 115.5 for the 99 and early 00. 00+ are same specs except for a 114 lsa.

 

Thanks....

 

Hey, thanks for that. I was needing that info as well. One more thing, I have the last four boxes for the cam input on desktop dyno, but dont know what numbers go in the top two. When I put in 114 for both I get a "A valid IVO value is required" error.

 

cam info
cam help

See if some of this info will help you fill in the rest of your cam blanks.

 

Ahh, ok, I think that the numbers that I have gotten are the .050 numbers and I was putting them in as seat to seat values. When I put them is as .05 numbers the cam calc lets it go. But now the numbers are all tweaked, TQ is too high and HP is too low?

http://home.nycap.rr.com/agreif/Truck/DD_stock.jpg

 

by looking at that pic I see multiple problems.....
* wrong heads (choose "LS1 aluminum head"...if you don't have the file I'll e-mail it to you)
* wrong cfm for the intake...try closer to 800cfm
* use "hydraulic roller" instead of "roller" cam...it makes a HUGE difference
* "stock manifolds and mufflers" is gonna get you a mildly wrong torque curve.....the stock truck maifolds are pretty good so you can try "headers and mufflers" to bring the torque curve in a little more


sorry I haven't posted on this before now....I worked with Dyno2000 and Dyno 3000 for quite a while before I got to the point that there just weren't enough LS1-specific airflow files to be useful...I wrote a bunch of my own but got sick of it.....the software *can* be very accurate, IF you are willing to input ALL of the info that you need for EVERY part (heads, cam, etc...) every time you need a new part

 

Thanks for the reply. Couple of questions

What about the GM vortec 855 file. Have you looked at that. I didn't originally put the LS1 file because I thought it give too much gain. It looke like there is not much diff between the two.

Where did you find this. I couldn't, that's why I ask.

THese trucks have hydraulic rollers. I chose "roller solid or hydraulic lifters" but you are saying that what I should use is "hydraulic flat tappet rollers?" the first option does give me more of a peaky torque and horsepower curve, while the second moves the peak a little further down the torque curve and decreases just slightly

OK, I plucked down HP manifolds and muffflers, it helped a little. the other options just gave me gains that are unreasonable.

Here's what I end up with. HP is close to stock (270) but the torque is way too far past the stock numbers (285).

http://home.nycap.rr.com/agreif/Truck/DD_stock2.jpg

Compare it to the shape of the curve here (this is the 03 curve with bumped HP and TQ)
http://www.gm.com/automotive/gmpower...s/lr4curve.jpg