your cam sounds pretty good, i was wondering about just having an xr265 or xr269 cut on a little wider lsa, like maybe a ~118 or something, oh and who is patrick guerra and how can i get in touch with him?

 

He is a cam specialist..here is his link..

https://www.performancetrucks.net/fo...mber.php?u=210

 

http://www.ls1gto.com/forums/showthr...hlight=cam+102


I must say that our needs in the GTO crowd are very similar to your needs in the truck crowd. I have no interest in ever going to FI yet wanted to make close to 450 to the ground with my mods. The EDC cam that was spec'd for my car was a 220/224 110 LSA cam with a .600 lift. It has tons of TQ down low, yet makes good power when I want to scream through the gears at 5000 revs. As mentioned before there is no "general" way to think of what LSA does because its all about overlap and the LSA's relationship to the Duration of the cam lobes as well as the ramp rate, and the overall lift.

Most folks tell you to run that 212 to 220 with 111-115 lsa ish cam for your 5.3's because without the supporting heads/valvetrain items, cams in the 224-240 range will just give you a VERY peaky truck, that will stumble on its face until it revs to 4000 rpm.........very sucky for a 4500 lb truck. Now if you have a 6.0, go a lil bigger. if you have FI in the works, lengthen the LSA to keep pressure from bleeding off. More TQ from the same profile, increase the lift (and make sure your valvetrain can handle it!!) I love my Flowtech Induction cam and would go to ED curtis FIRST. He is a Cam master and has a bunch of knowledge with LS's, fords, big blocks, small blocks. You name it, he has dealt with the cams, heads ect ect. Tell him what your looking for, and he will hook you up

Nate

 

Yeah, the above post (Patrick) is also an excellent resource

 

so an 112 lsa would have a narrower power band? and a 118 lsa would have a broader power band?

 

Another way to look at LSA in relationship to powerband is as follows: for a given duration over a given rpm range an engine is going to make the same amount of average torque (HP is a function of rpm & torque). The LSA will show you how the power is delivered in that given rpm range. For example: if a 2xx/2xx cam makes an average of 300 ft-lbs of torque over a range from 2500 to 6000 with a peak at 4000 rpm with a 112 LSA cam. If you replaced it with a cam with the same duration specs but an LSA of 118, over the same rpm range the average torque (area under the curve) would be the same, the peak torque RPM would be the same but the peak torque output would not be as high. In other words the ramp in torque output would not be as severe. (More of a hill as opposed to a steep mountain).

 

Well said!^^^^^ I think that sums it up.
Im glad you started this thread 006rcsb, it explains better than most threads ive read