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Old 11-05-2007, 11:01 AM
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383 cam choice

Hello everyone I'm new to the forum but I've read a lot here before registering and now i really need help I'm building a 383 with hsr and i cannot make my choice over the cam i will use. quick description of what i have right now...Eagle crankshaft 4340 forged h-Beam rod eagle 6" srp piston forged aluminum -16cc all clevite 77 bearings the complete intake kit of Holley(manifold fuel rail 30# injectors 58mm TB commander 950 in line 255lph fuel pump)the heads that i will be using are bowtie casting # 867 ported on flow bench at 300 cfm intake flow...i will probably use 200 shot of now but not for now maybe in a year or two so that's about it for what i have now and i have 2 choice of cam for now
comp cam : 12-468-8
Intake Duration at 050 inch Lift: 242
Exhaust Duration at 050 inch Lift: 248
Valve Lift with Factory Rocker Arm Ratio: 0.584 int./0.579 exh. lift
Lobe Separation (degrees): 113
Basic Operating RPM Range: 2,200-6,200

lunati : 54756
Duration at 050 inch Lift: 232 int./242 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.510 int./0.525 exh. lift
Lobe Separation (degrees): 110
Basic Operating RPM Range: 2,000-6,500

I will use the car 90% street 10% strip but I'm looking for 500hp and more but i want the car to be fun to drive on the street so i don't know what to put in there so if someone could help me here would be really appreciated...if you have other cam to suggest go ahead I'm open to all offers..if you need more info on my setup just ask i might have forgot some important details

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Old 11-05-2007, 12:33 PM
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Just a few questions

What kind of car is it going in?
What gear do you plan on running?
How much stall do you plan on running?
What tranny are you going to run?

Adam
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Old 11-05-2007, 12:52 PM
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ook so this is going in a 1991 pontiac trans am GTA i'm planning using a 3.73 rear gear ratio and using a borg-warner t-5(i know it will not last long)i will switch to a tremec tko600 or rebuild my t-5 heavy duty but for now this is what will be the main setup
thanks for your ineterest
martin
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Old 11-06-2007, 07:41 AM
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That cam is to big for a car 90%driving on the street . And your gear is to small . A smaller cam in that 383 will give you bigger power .
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Old 11-06-2007, 07:49 AM
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Quote:
Originally Posted by CHEVY ONE
That cam is to big for a car 90%driving on the street . And your gear is to small . A smaller cam in that 383 will give you bigger power .
Hey, TANGO, don't you know that it's against forum rules to post under multiple names or to try to get around a suspension by using another name?

We have our ways of finding these things out, you know. Wanna come clean?

tom
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Old 11-06-2007, 08:01 AM
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ook so if this one is too big what specs should i go for???
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Old 11-06-2007, 08:11 AM
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If I had to pick from the two you have listed, I would pick the Lunati.

tom
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Old 11-06-2007, 08:34 AM
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I agree with Tom on the Lunati. When it comes to cams always err to the smaller side. One of the rules of thumb is that more cubic inches will tolerate more duration. You didn't mention your compression ratio. Also at what lift did the 300 cfm number come at?
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Old 11-06-2007, 10:32 AM
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oook well the compresion ratio is not set for now it depends on what gasket i will put but i wnat something between 10.5 to 10.88:1 and for the 300cfm flow it comes at .6 lift...i just found a new cam that can be very interesting comp cam 12-419-8
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Old 11-07-2007, 08:23 AM
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what you guys about the cam 12-419-8 is it better than the two others one??
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Old 11-07-2007, 08:50 AM
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What are you running for the ecm? Is this a speed density system? I would run something with a wide lsa.
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Old 11-07-2007, 01:30 PM
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i will run the commander 950 ecm and yes it's speed density i call the guy that is goign to assembled my head and he told me that i should go with at least .580 of lift or else it wont be enough and the car will choke a little bit so what you think???
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Old 11-09-2007, 11:01 PM
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You go to a website called www.lazercams.com I built an 383 stroker and I got a cam from this place. It really made it come to life. They are a little bit more expensive but I really seemed to like it alot.
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Old 11-10-2007, 10:11 AM
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Quote:
Originally Posted by machine shop tom
Hey, TANGO, don't you know that it's against forum rules to post under multiple names or to try to get around a suspension by using another name?

We have our ways of finding these things out, you know. Wanna come clean?

tom

??? Have I missed out on something?
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