[cowbay]

Well here is my question to all. I am building a chevy 383 stroker motor to put into my 63 chevy impala. This car will be street driven 5-7k a year with probably 8-10 trips to the track. Now here is the twist I am building this for stock appearing drags. So I am using 2.02 1.60 fuelie heads that shall are ported and polished that should flow 240-250CFM, the intake has been worked and my head guy says it will flow like a elderbrock performer. Using a forged eagle rotating assembly with 11-1 compression flat top pistons. This is a stick car, 4.11 rear, and will be running 28" tall tires. Carter carb that has been modified this will flow around 700cfm. I have been on the phone with comp cams and performing the simulator and I am down to the following cams:
Comp 286R 230 int. 236 exh. lift int.552 lift exh564 110 lobe

Comp 268R 224int. 224exh. Lift int. 525 lift exh 525 110 lobe

The one that interests me the most:
Comp X242 int. 248 exh. lift int. 570 lift exh. 576 110 lobe

What do you guys think? The choices are mind numbing these days. I agonized less about proposing to my wife than this cam choice. Thanking everyopne for their thoughts in advance.

[gregb]

With that compression ratio I'd be leaning toward the larger cam, with the smaller one you might have trouble running it on pump gas. There were some posts on dynamic compression ratio a while back, you should look them up, otherwise read here

http://www.empirenet.com/pkelley2/DynamicCR.html

[BORTI]

If the heads are going to flow that much,I would go with the split duration camshaft.IE the 286R

[cowbay]

That is interesting points of view. What is your feelings on streetabilty?

[gregb]

I built my 383 with less compression and used Comp XR282HR hydraulic roller cam, which has 230/236 duration and .510/.520 lift with 1.5 rockers, I only have about 9.8:1, Sportsman heads, and while it's in a boat I don't think I would have any streetability problems if I dropped it in my Chevelle. It idles about 1000 rpm, could probably get it lower with a little more creative timing but I don't worry about that on the water, and it pulls 12 inches of vacuum, not really enough for power brakes but a vacuum canister would take care of that. I think my dynamic comp ratio ended up about 7.8:1, might be a tad low for max power, but it runs on 91, and boat engines are a little different in that they're always under a load, and you wouldn't hear it knock with the open headers that are on it, and I don't have any problems or see signs ot detonation when I check the plugs.

[Double_v23]

with a manual transmission, low gears, and 11:1 compression you can pretty much put whatever cam you want in there. I would go for the most radical of the 3.

[Cdminter55]

If you are going to drive it on the street you would be better off with a cam with 230-240 duration. Also with the 11:1 compression you will probably will not be able to use pump gas. I think most 383 motors reach peak hp and torque around 5800-6000 rpm so look at the power range of the cams. Good luck.

[ap72]

Originally Posted by Cdminter55

If you are going to drive it on the street you would be better off with a cam with 230-240 duration. Also with the 11:1 compression you will probably will not be able to use pump gas. I think most 383 motors reach peak hp and torque around 5800-6000 rpm so look at the power range of the cams. Good luck.

that's the kind of reading they use to stuff pinatas...

go with the 286, your heads and intake pretty much limit anything bigger due to their restrictive flow. If you'd change them then I'd be all for the bigger one, but with what you have its just too much of a mismatch. Even if it does flow like a performer... those are intakes designed for low end torque, not high HP.

[Double_v23]

Originally Posted by ap72

that's the kind of reading they use to stuff pinatas...

I don't get it??? The reading is sweet?

[ap72]

Originally Posted by Double_v23

I don't get it??? The reading is sweet?

No, its just not good for much else... maybe hampster cages or backing for BB gun targets...

[cowbay]

So I see there is a larger concencious towards 286. I am also open to any other suggestions in regards to cam profiles.