Chevy 383 What cam to run???? Also Forged or hyper pistons?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-26-2006, 06:20 PM
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Chevy 383 What cam to run???? Also Forged or hyper pistons??

I have a 383 that im currently building and need to find the right cam for it. It goin in my s10 and will be a street/strip car.
So far I have:
350 block machined
Eagle 383 kit (rods and crank)
KP flat top -7cc hypers
72cc Dart Iron Eagle 215cc 205/160 heads Manley street flo valves and springs good to .550 with 1.6 rockers
Edelbrock Air Gap intake
Holley 650 carb
Msd 6al with rev limiter
I need to find a cam to run this setup on. I plan to have around 10 - 10.5 compression. I have look at the Comp cams Xtreme energy. Something around 230s. I dont want a rough idle or maybe a little rough. Not too much tho.Should i get a hydraulic or machanical and roller or flat tappet???
Also a friend has a set of new kb forged pistons would they be better he said he would trade me straight up. They r also 7cc.

Thanks

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Old 02-26-2006, 07:37 PM
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Have you already purchased all of these parts? You're engine combination is not very well matched.

You have high winding heads, but yet you are using a very small carb and you want a fairly smooth idle? This is not the way to go about it.

If you want a stout performing 383 that is very snappy and delivers great street performance without being too radical, you will should use a smaller runner head.

Alot of guys will tell you to use 200 runners, but even a good flowing 180 runner, or vortec type heads, with a moderate camshaft (Comp XE274) will give you the performance you are looking for. I would increase the carburetor size to a 750.
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Old 02-26-2006, 08:02 PM
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89S10,

I'm running a Speed Pro cam (part No. 229-1994) in my 383. I have the same Eagle rotating assembly but, different heads, manifold and Carb. The Speed Pro cam is a hydraulic flat tappet, dual pattern, 488 lift and 232 degrees duration on the intake, 234 on the exhaust, all at .050. I like the cam. A little lumpy but not too bad.

If I could trade straight up, a set of hyperutectic (sp) for a set of forged, I'd do it. The forged might be a little noisy but, should be stronger and hold together better if you ever have any problems.

Just my opinion,

Dale
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Old 02-26-2006, 08:20 PM
How fast is fast enough?
 
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I would keep the heads and go with a slightly larger can than the one mentioned. I also have an s10, and it doesn't take much to get one moving from a stop light, and all things considered I would go with a combo that purposely moved the torque up a little higher due to a truck's light rear end.
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Old 02-26-2006, 10:17 PM
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I got the heads very cheap off a friend. They are like new. I really wanted 200 or 180s like NAIRB sayed. But i could pass up the deal. I also have the carb lying around that was given to me for free. I was goin to use it till i saved up for a 750.

Parts i have are the Eagle kit, heads, intake, Forged pistons(traded), Msd ignition.
I need a bigger carb i no. Mainly im just looking for a good cam for my setup.
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Old 02-26-2006, 10:31 PM
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Quote:
Originally Posted by 89SDime
I got the heads very cheap off a friend. They are like new. I really wanted 200 or 180s like NAIRB sayed. But i could pass up the deal. I also have the carb lying around that was given to me for free. I was goin to use it till i saved up for a 750.

Parts i have are the Eagle kit, heads, intake, Forged pistons(traded), Msd ignition.
I need a bigger carb i no. Mainly im just looking for a good cam for my setup.
With the 383, the heads are not too big. I would run a hydraulic roller, something with as much lift as your springs will allow. Maybe a 260 or so duration. You can get away with more cam with the bigger engine. If you want to make more power at higher RPM, retard the cam 4-6deg. To make more torque early and build compression, advance the cam. Check your valve clearance because advancing the cam makes the clearances a little closer.

A friend of mine has a really strong bracket car with this combo. Have fun!
Oh by the way, get the forged pistons, if you should want to run a shot of nitrous, you will need them.
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Old 02-27-2006, 10:33 AM
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Dart 215 are perfect for a 383. With a 650 carb they are not going to hurt you at all.
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Old 02-27-2006, 12:58 PM
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I think my springs are good to .550. If say a cam is rated at .520 does having 1.5 or 1.6 increase it or no???
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Old 02-27-2006, 01:08 PM
How fast is fast enough?
 
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yes it increases it, that's the whole purpose of it.
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Old 02-27-2006, 01:13 PM
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also

These are the cams i was looking at buying
All hydraulic flat Tappet
CompCam Xtreme Energy @050
240 int./246 exh Valve lift 0.507 int./0.510 exh. lift***
246 int./256 exh Valve lift 0.516 int./0.522 exh. lift*
230 int./236 exh. Valve lift 0.487 int./0.490 exh. lift**

the 240/246 was the one i was gonna run.

I also looked into the Crane Cam Energizer around 230-240 @050
Will a cam run rough at idle??
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Old 02-27-2006, 01:14 PM
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By how much??? what is the stock ratio 1:1??
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Old 02-27-2006, 01:29 PM
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Quote:
Originally Posted by 89SDime
I think my springs are good to .550. If say a cam is rated at .520 does having 1.5 or 1.6 increase it or no???
The rocker ratio increases the lift at the valve. Cam grinders can quote lift at both cam lobe and valve. If they quote lift at the valve they will note the rocker ratio. If your cam has .340 lift at the cam lobe it would have .510 lift at the valve using 1.5 rockers. It would have .544 lift at the valve with 1.6 rockers.
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Old 02-27-2006, 01:36 PM
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You should find someone who has "Desktop Dyno" and run each cam with the cam card specs with your specifications. Then you will be able to choose the best power curve for your engine.

Whatever you choose, you need to put some modeling clay on top of the piston, assemble your head and turn the engine slowly through a cycle so you will know how much valve to piston clearance you have.

If they are close enough they barely touch, you can open the clearance by retarding the cam.
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Old 02-27-2006, 02:04 PM
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There is always the "how much you wanna spend?" question. If money were no object I would certainly go for a roller cam. I have flat tappet hydraulic Lunati Voodoo (227 int/233exh @ .050 .489/.504 lift with 1.5 rockers). The cam seems very happy with the 9.8 compression and the tiny 156 cc runners from an old set of 64 cc camelbacks. The manifold is a Performer. The biggest limiting factor of my engine is the intake and heads. If I were to do a similar buildup I would use the next up Voodoo cam (241/249 @ .050 .526/.546 lift) and a bit more compression (10.25-10.5 range). I would like to a set of AFR's (180-200 cc range) and at least a performer RPM intake.

I vote Voodoo. They make a ton of torque while still having plenty of breatheability to 6200 + for my Voodoo anyways. The Voodoo has plenty of street manners nice lope without being too much to throw you around at idle. But hey, a race motor isn't meant to idle, just run at WOT! and if you want power you gotta have a cam big enough to allow enough air and fuel in to make power.

just my thoughts...
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Old 02-27-2006, 02:40 PM
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You don't have enough compression for anything over a 235@.050. 240@.050 is getting out of the street range and a lot closer to race only stuff.
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