LsxFix

What determines the lobe type? Is it a combination of Duration and Lift, or Lift only? What lobe type would a custom cam in the range of 226/230 .625 .600 108LSA be?

I am planning to stick this cam in my carbureted LS1 setup (GMPP single plane & Mighty Demon 750). I am assuming this cam would give a really good low end torque, wright?

Beast96Z

iTrader: (21)

You've probablly already seen a cam lobe before. The way the ramp of the lobe is ground determines it's type. Diffrent lobes have diffrent charecteristics, but duration and lift at givin lift intervals make up a lobe. You have to look at more than just the .050" lift that most people advertise. In the cam range you listed, you would have a 227/230 .639"/.592". The thing to look at is the other lift ranges. At .050" you obviouslly have 227/230, but at .200" valve lift you have 153/151. So that tells you that even though your cam is a traditional cam at .050", it goes reverse quickly. Basically, the smaller 227 lobe acts bigger than the 230 lobe. The 227 lobe is actually similar to a 232 XE-R lobe in size. With that in mind, you need to determine if your heads have a good enough intake to exaust ratio to use a reverse split camshaft, even though you wouldn't have thought that by looking at the .050" numbers.

LsxFix

Thanks for the info Beast96Z. So, can you tell/guess whether the intake lobe on a 226/230 .625 .600 @.050 108LSA is a XE-R or LSK lobe?

Beast96Z

iTrader: (21)

It's neither. Those exact specs are not in the XE-R or LSK family of lobes. The specs I listed above are the "closest" LSk and XE-R specs to the cam you listed.

DavidNJ

Aren't the XFI and LSK lobes just newer designs than the XE-Rs? I note that Comp has LS1 truck cams spec'd with XFI lobes.

Beast96Z

iTrader: (21)

Yes, there Comps latest offerings. Although the XE-R is still one of the best out.