Your looking for valve overlap. Look for a high dur / low LSA. I would say the lope might start at 220+ degree dur and 110- LSA. But that would be a little lope. If you want to shake your teeth out keep it around 108 or less on a high lift cam. Is it going to be in a race car or a daily driver?
its goin in a daily driver for the moment but within a year it'll be a street maching its a 388 stroker smallblock chevy, i have a comp cams 280H in it right now but i dont like it no low end and it doesnt lope liek i want it too, main power is only after 3500 rpm.....which i might add is a ****load of power but its too high for me access where idrive i want low end but i want power all the way to 6400 rpm 6000 minimum and a lopey idle
You want both worlds, low end power and a rough idle. But, one excludes the other. You seem determined to have that rough idle which means, as stated, you need high duration which drives the power curve up.
You might be able to do a custom ground cam, keep the duration low (like 220/225), but narrow the LSA to 106 or 104 to create the overlap and then install it 4 deg. adv. to pick up a little more bottom end. If you have a PC dyno program you could try it and see.
Comp XE 262, 268 good low rpm power with nice lope and good driveability. I will never understand why people want to sacrifice low end torque on a street motor for a lopey idle. Tune your exhaust instead if you must have a lopey idle. Stand next to a new Vette and tell me you don't like the exhaust sound but it idles smooth as a baby's butt!
In my experience, especially with big displacement motors, a variable pump lifter, Rhoads specifically, can give you the best of both worlds, a rumpity-rump idle with major power when you make it spin.
Look through Comp's custom lobe catalog. Choose a duration and LSA for you target use of the vehicle, period. If you want it to be a touch lopey sounding, use a roller with a really fast exhaust opening ramp and then use good quality headers. The fast ramps will put a more forceful exhaust pulse in the exhaust giving it a slight tick-it sound. Not the lopey idle you want, but a nice sound anyway. I learned this from a Lunati grinder who is retired. He hangs around some of the Oldsmobile forums you might be able to find him for more tech on it.
If you choose a cam for how it sounds, you are almost guaranteed to be disappointed in its performance.
Comp just came out with this line of cams they call the thumper.It sounds like what your looking for. http://www.compcams.com/thumpr/
You could also ask lazer cams http://www.Lazercams.com
I would go with a custom grind.Something similiar to a 274XE but with a 106lsa and 104intake centerline
True, but those thumpers START at 283 advertised, 227 degrees @50. That is strictly 2500-stall and light car territory in my book. He said he currently has a 280 advertised cam and that's too much for him.
If you could maybe get them to do a 212/222 on that same 107 LSA you might retain some lope but bring your torque peak out of the rafters.
I haven't ran it yet, but I'm using a Lunati VooDoo 262 cam with 1.6 rockers and a 105 LSA in my 388 in hopes of exatly what you are searching for. I'm running it in a 87 TA with stock tire height so low end isn't a huge ordeal, but I want a streetable cam with a nice sound. I've ran bigger rand smaller camms and they all have their place, but I think this time around this cam will be perfect. Also according to DesktopDyno (which is really just a good SWAG) my peak torque should be around 3500 with peak hp at about 5500. 475/450. With a good dual plane, headders, a good carb, good heads, roller rockers and gapless rings I say that should be pretty possible.
Correct me if I'm wrong but I believe engine size will have an effect on how a cam sounds would it not? I don't know where I got this or even if it's right but somewhere along the line I've come across this. Would a Comp 280H sound rougher in a 283 than in a 400? Also, I know big cams tend to have more of an effect on vacuum on smaller engines than on the bigger ones.