383 Cam choices - Team Camaro Tech
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post #1 of 12 (permalink) Old Jan 3rd, 06, 03:27 PM Thread Starter
 
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383 Cam choices

I cant decide on a cam for my 67 camaro. Here are my choices, feel free to add yours!

The car will be 90% street driven and see the track a few times a year.

If you will, please state why you would choose that particular cam.

Engine specifics are 383; forged internals, 5.7 rods, flattop pistons w/ valve reliefs, performer rpm airgap, demon 750 carb,full MSD ignition, dart pro 1 aluminum heads with 200cc runner, 64cc chambers, 2.02/1.60 valves. Dart says no higher lift than 515 with the springs the heads come with..

These are Hyd flat tappet cams.

Comp cams-CCA-12-250-3= 240 int./246 exh. @50 , 0.507 int./0.510 exh. lift//// 110 LSA //// RPM range is 2,300-6,500 RPM

Crane cams-H-238/3347-2S-6= 238 int./244 exh. @50 , 0.502 int./0.516 exh. lift///// 106 LSA ////RPM range is 3,200-6,400 RPM

Edelbrock cams- EDL-7102, 234 int./244 exh. @50 , 0.488 int./0.510 exh. lift//// 112 LSA ////RPM range is 1,500-6,500 RPM
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post #2 of 12 (permalink) Old Jan 4th, 06, 07:33 AM
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Wes
 
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Re: 383 Cam choices

What tranny and rear?
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post #3 of 12 (permalink) Old Jan 4th, 06, 09:11 AM Thread Starter
 
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Re: 383 Cam choices

Muncie 4 spd and 3:73 gears
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post #4 of 12 (permalink) Old Jan 4th, 06, 12:17 PM
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Re: 383 Cam choices

I would tell you to go with the. Comp cams CCA-CL12-250-3. It includes the lifters that you need anyway. This will give you a nice "lopy" idle. You should still be able to pull about 10#'s of vacuum for brakes if you need to. It sounds like your going to have a pretty hot set up. I had Comps. CCA-CL12-246-3 In my last 350 with reworked stock 2.02 heads, Weiand Stealth, Holley 4160 600 cfm, and 3.73's out back. It was very fun to drive. It launched nice and pulled good through 5500. Some people complain about the valve train noise. Just make sure your valve train is adjusted right and well lubricated and you'll have no problems.


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Last edited by HarleyD67; Jan 4th, 06 at 11:32 PM. Reason: ??
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post #5 of 12 (permalink) Old Jan 4th, 06, 12:18 PM
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Wes
 
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Re: 383 Cam choices

I think they're all too much for the street, where you'll spend 90% of your time between 1500 to 4000 rpm. If you have a cam that won't work at 1800 rpm, you'll be doing a lot of revin' and clutchin' to keep the engine in her power band and that's no fun.

I have to giggle at the Edelbrock claim that their flat tap hyd 234/244 degree cam @ .50 will be good down to 1500 rpm,..get real!

I'd go something in the 225 @ .50 range,..you'll be a lot happier and it won't cost many ponies up top. Plus your pwr brakes and idle will be mo-betta.

Which brings up a point,..it's hard to tune a carb for the street with little vacuum,..enrichment comes in too early,..idle circuits don't come in at all,..etc.

My opinion.
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post #6 of 12 (permalink) Old Jan 4th, 06, 02:06 PM
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mike
 
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Re: 383 Cam choices

I agree that these cams seem a little too much but what about the compression ratio? With flattop pistons and a 64cc chamber if I'm not mistaken will give too much compression for a street motor IMO.

1967 convertible T-1
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post #7 of 12 (permalink) Old Jan 4th, 06, 03:44 PM
 
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Re: 383 Cam choices

compression will be close on pump gas. Just need to be careful with the tune. A larger cam will also help bleed off some of the cylinder pressure (like the comp cams one you listed). I would also double check the .515 limit on the springs...seems low to me for that kind of head.

Take a look at Lunatis Voodoo line (double check your springs before you bother )

60103LK 268/276 227/233 .489"/.504" 110/106 Hyd/Hyd 1800-6200
60104LK 276/284 233/241 .504"/.525" 110/106 Hyd/Hyd 2200-6400
60105LK 284/292 241/249 .525"/.546" 110/106 Hyd/Hyd 2500-6600
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post #8 of 12 (permalink) Old Jan 4th, 06, 04:27 PM Thread Starter
 
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Re: 383 Cam choices

Quote:
Originally Posted by Straight-line-69
I think they're all too much for the street, where you'll spend 90% of your time between 1500 to 4000 rpm. If you have a cam that won't work at 1800 rpm, you'll be doing a lot of revin' and clutchin' to keep the engine in her power band and that's no fun.

I have to giggle at the Edelbrock claim that their flat tap hyd 234/244 degree cam @ .50 will be good down to 1500 rpm,..get real!

I'd go something in the 225 @ .50 range,..you'll be a lot happier and it won't cost many ponies up top. Plus your pwr brakes and idle will be mo-betta.

Which brings up a point,..it's hard to tune a carb for the street with little vacuum,..enrichment comes in too early,..idle circuits don't come in at all,..etc.

My opinion.
Let me preface this by saying I am asking questions because I really dont know the answers.

When you say "I think they're all too much for the street" does that mean the cam is just larger than i will probably need for the street? or are you saying that I will lose some streetability / reliability because of the cam size?
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post #9 of 12 (permalink) Old Jan 4th, 06, 04:41 PM
 
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Re: 383 Cam choices

Quote:
Originally Posted by ertoys
Let me preface this by saying I am asking questions because I really dont know the answers.

When you say "I think they're all too much for the street" does that mean the cam is just larger than i will probably need for the street? or are you saying that I will lose some streetability / reliability because of the cam size?
Both go hand in hand,because the cam is too big for the street,you will lose your streetability,ie-power brake vacume,power steering(posible),and over all comfort(lopey idle).If your not concerned with all of that and you just want all out performance,and your not gonna drive it alot(weekend cruiser) then i say go for it.If you will be driving the car alot then I would scale down a bit like mentioned around 225-230 at 50 it will be more streetable.Ive got the Comp XE-274 and it is a good cam,very streetable.Good luck in your choice cams are very hard to make a decision on, I know.

RC
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post #10 of 12 (permalink) Old Jan 4th, 06, 05:02 PM
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Jack
 
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Re: 383 Cam choices

I've been running the CCA-12-250-3 for about a year now. It's in a 383 with forged Probe flat top two valve relief pistons, 750 Demon with annular boosters, Edelbrock RPM manifold, Edelbrock RPM 64cc heads (2.02/1.60) with 1.6 roller rockers, TKO 5 speed and 3.73 rear. It idles between 7-800 RPM depending on the tune and gas and most definately has a good lope. Truth be told, it's not great fun after a while in slow traffic (40 MPH and below) because you've got to keep the RPM up to stay near the power band. Like was said earlier, lots of shifting. That said, it makes up for it and pegs the fun meter when there's room to run it up or just enjoy a steady cruise. Assuming you get the right parts to make it all work together, it really depends on how much you want to put up and where you normally drive the car. I made the cam choice after a lot of thought and have no intention of changing until I swap heads. Make your choice and don't look back.

Jack Eggers
67 Camaro, Blue, 327, 4L60E, Dana 60
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post #11 of 12 (permalink) Old Jan 4th, 06, 09:14 PM
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Wes
 
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Re: 383 Cam choices

I've got the Comp Cams 270H with 224 @ .50 and .470 lift in a SB-400 with AFR 195's and 10:1 compression in front of a M-20 tranny and 3.73 rear.

I couldn't be happier,..good idle and vacuum, great street manners, and strong to 5500+.
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post #12 of 12 (permalink) Old Jan 5th, 06, 12:14 AM
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Re: 383 Cam choices

I have a '69 Chevelle right now with a Edelbrock Package 383. I got flat top KB pistons, Dart 5.7 rotating assembly, Performer RPM Heads, Performer RPM Air-Gap intake, and Performer RPM cam listed above. That cams idles great for its size and pulls plenty vacuum for brakes at all RPM. The wider lobe separation angle is the key to it's success. It may be hard for some to believe (including myself till I experienced it) but this setup works well with a stock stall and a 2.73 rear gear. I haven't changed it yet. I want a 3.55-3.73 gear and a 2500 stall. My grandma could drive it to the grocery store with no problems but it will run when you mash on it.

I want to add that your head choice might be a little big for anything smaller than the cams you chose. Also, highest performance will be from a 106 lobe separation angle but will sacrifice some vacuum at idle. Last of all; To get away with the high CR on the pump gas, Zero deck clearance the block and run a .039 head gasket for proper quench area.

Ray
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