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Old 10-28-2008, 04:32 PM
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383 cam question

the plan - 383 with all forged eagle rotating assembly. with 5.7 or 6" rods...havnt decided yet. dart seems to be the big name in chevys heads these days, instead of the old 2.02 heads. im wanting 450hp give or take. ill go with cast iron heads not aluminum. now where im lost is what dart heads should i go with and why? and i want a nice street cam. hydralic or solid roller? whats better for a street car? pump gas too. i guess im hoping for someone to see this and just throw down a bunch of info where a guy like me can understand it i mean im no dummy i can put a steel 400 crank and rods in this block after its clearanced and some nice pistons with 2.02 heads and a aluminum intake and a carb i got on the shelf but with all this technology new ideas why would i want to do that unless i was going to make a car to put in a museum? i think thats what they call old school


thanks ahead for any help. im sure some of you guys get tired of these simple questions

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Old 10-28-2008, 08:15 PM
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Cam questions are always entertaining, they are like walking through a mind field especially when you are the first to reply... so lets go the 'PC' route...

Alot of assumptions are bult into my recomendations here... I imagine you are looking for a street friendly 383 that runs on premium pump gas and that stays below 6,000. If you are looking for more rpms, my recomendations are wrong and you want a larger runner for head, a larger valve, and a bigger cam. If you looking for a lower redline, again my recomendations are off. Solid roller- I would stay away from even though you will make the most HP with them. The lifter are the biggest draw back even though Comp and Lunatti have released better versions for the street, these 'new' roller lifters can cost upwards of $600 (but they are rebuildable). I assume you will/do have around 9.5:1 compression and a decent gear (3.73 comes to mind). If it's an auto a 2,000 rpm stall would be nice. Vehicle, I have no idea, but assume a passenger car with about weighing in at 3,750lbs.

Dart Iron Eagle Platinums- 200cc 2.02 valve.

A camshaft of your choice in the mid 230 duration a .050 range and .520-.530 lift from your favorite cam company. If I could recomend a cam, I would say...Comp XR282HR 230/236 .510/.520- this is a roller, if you are looking for a solid flat tappet (less money) same recomendation but you'll have less lobe lift.

Intake- Edelbrock RPM Airgap
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Old 10-28-2008, 08:51 PM
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well you hit the nail right on the head...pretty good assumptions actually. now i looked up that cam and that head and that makes sence. but theres a few different iron eagle platinum series heads 200cc 2.02 valves. i think the one to go with would be "SB-Chevy Iron Eagle Platinum Series Cylinder Head 200cc Intake Ports 64cc Combustion Chambers 2.020 Int/1.600 Exh Valves 1.437 Springs 140lbs 1.800 .620 Max Lift Angle Plugs."

note the .620 max lift. correct?
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Old 10-28-2008, 09:04 PM
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what about an intake?
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Old 10-28-2008, 09:11 PM
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Quote:
Originally Posted by boatanchors
what about an intake?
Edelbrock RPM or AirGap.
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Old 10-28-2008, 09:12 PM
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If you have hood clearance Eldelbrock RPM air gap
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Old 10-28-2008, 09:33 PM
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yes, that is the Dart head is the one was refering to, check out competitionproducts.com for the best deal on those heads. .620 lift springs might be overkill but they'll work. Make sure the 64cc chambers work with your deck height, piston cc, head gasket, etc... .040 quench is something to shoot for or near, don't go lower. A good quench does wonders in many ways, fuel milage, combustion, atomization, power, and helping stave off detonation.

My intake suggestion was at the bottom of the post- Edelbrock RPM Airgap

Best of luck
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Old 10-28-2008, 09:35 PM
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I just built a 383.
I researched,,,for about 3 months,,,for the best pump-gas combo. And here's what I ended up with:
Eagle rotating assy...forged crank & forged H-beam 6" rods
w/ SRP forged flat top pistons
Total Seal rings
Comp Cams XR294HR... retro-fit .540/.562 294/300 dur.
kit w/ hyd. roller lifters
Comp Cams Gold Aluminum rockers...1.6 ratio (corrected lift .576/.599)
AFR Eliminator 210 76cc...race cut 2.08/1.60
-9.8 compression ratio-
Edelbrock Performer Air Gap
BG Mighty Demon 750
1 3/4 headers
I used 6" rods because it puts less stress on the bore of the block.
A hyd. roller cam because its better than flat tappet and you don't have to keep adj. valve lash like a solid.
AFR mainly because of the proof seen on dynos.
Check this out:
http://www.popularhotrodding.com/eng...ild/index.html
Air Gap because its dual plane designe is good for low end power and its good for 6500 rpms,,,fits in nice w/ cam power range.
The motor has not been on a dyno but should make around 530-540hp. I did have a dyno'd 400 horse motor,,,on a 150 shot it still didn't quite feel like this one,,,sorry rear end wont hold a launch at the strip w/ new motor,,,blew up trans on street.
My motor is in an s10, 2800lb, TH-350,3600 nitrous super street fighter stall, and 4.10 gears (all this matters when choosing a cam). It idles well (not the roughest idle possible but definetly nice) ,has killer throttle response, and makes good power all around.
Not saying its the best combo out there but it works for me....sorry about the novel just trying to help.
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Old 10-28-2008, 11:29 PM
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derekg383, running your combination through DynoSim yields 530 hp @ 6000 and 496 ft/lbs of torque @ 5000

Suspecting the cam needed more static compression ratio, I raised the c.r. to 11.0, swapped out the carb for an 850 and retarded the cam 2 degrees. These changes resulted in 568 hp @ 6500 and 520 ft/lbs of torque @ 5000.

Just on a whim, I swapped the 6.0 rods for a set of 5.7 units and lost 2 hp and 2 ft/lbs.
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Old 11-03-2008, 12:00 PM
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Techinspector1, I'd love to have Dynosim, is it downloadable?
Sorry, off the subject
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Old 11-06-2008, 11:58 AM
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Quote:
Originally Posted by derekg383
Techinspector1, I'd love to have Dynosim, is it downloadable?
Sorry, off the subject
I bought the program off the web for $99. On sale. Regularly $249. I've had more fun with it than a barrel of monkeys.
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Old 11-06-2008, 03:59 PM
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ok thats a dual quad set up i believe. so for carbs i should run 2 650s? thats a lot of carb. so with that cam the dart 2.02 valve heads 64cc the edelbrock airgap and 2 650s what do you think the hp would be at roughly if i went with that set up? and the torque? it all sounds pretty good. im debating if i should go with the scat rotating assembly or eagle with 6.0" rods and flat top pistons. any suggestions on that would be cool as well
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Old 11-06-2008, 04:04 PM
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nevermind i double checked i looked at the wrong intake. probaqbly go with a 750 carb then sorry
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