Does anyone know about what size duration on a cam you can have before it starts that famous lope? I know with a TBI you can't have too high of a duration, but I am curious about cam size with a carb.

 

Look at some of the Crane Compupro cams, they are supposed to be pretty good.

 

My comp cam xtreme energy 270HR cam .495/.503 lift 218/224 dur. has a decent lope to it. It doesn't sound like anything radical but its a very noticeable rough idle. I don't have headers yet so i don't know how much this accents the lope.

I would suggest reposting this in tbi because people there might now how much intake duration you can get by with a stock chip. For a maf tpi i can get by with this cam but your upgraded L03 is probably already in need of a custom burnt chip.

A good cheap upgrade cam for an L03 might be a 350 tpi cam and 1.6 roller rockers, or a GM Hot cam. Regardless of the your cam choice i would suggest replacing your heads or at least do some basic port work to your heads to get the most out of a cam. Also new valve springs are a must and check your lifters when there out.

Edit: Oh ya whats your block? Roller or flat tappet? and whats the cam thats in it now?

 

Comp xe268 has a lope in my sbc 355, but the engine doesn't shake, has good brakes. In my Pontiac 400, you can bearly tell it's in there till you drive it.

 

if you want a comp xe268 i'll sell you mine for $30, only has 300 miles on it, i bought it, put it in, and hate it, it's too small, so now i'm getting a comp xe284 or 292...