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383 cam choice

This is a discussion on 383 cam choice within the Performance forums, part of the General Discussion category; Originally Posted by SUBURBIAN Sure, that's fun. Those things are real tough to isolate single variables though. Don't ever expect ...

  1. #21
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    Re: 383 cam choice


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    Quote Originally Posted by SUBURBIAN View Post
    Sure, that's fun. Those things are real tough to isolate single variables though. Don't ever expect to make the numbers that one of those things quotes either. There is more value in matching up parts for an excellently optimized and balanced package than there is in picking a cam based on some marketing team's dyno claims. What kind of rings are in a dyno test mule? Operating temp? Exhaust setup (if any), induction setup, etc, etc, etc. Small cam, big torque. There are a few people on FSC that get it... join us.

    I hate to quote a ford guy, but...

    horsepower sells cars, torque wins races.
    "join us"
    ? who me ?
    if that was for me - I was preaching small cam = big torque. I'd originaly typed "build a torque monster for the street and build high horsepower for the racetrack", but I edited that down. Guess I've heard that ford guy's line myself many times over.

    I like the Voodoo 213/219 @ .050. as being the largest for a 383/auto in a normal truck. But smaller ones should also be considered. Sometimes it's the owner's driving style and expectations that will determine which cam is used.

    I just bought a GM Ramjet topend & cam ( cam 196/206 @ .050 ,vortec heads, fuel inj manifold, injectors & pc , all with 6,000 miles) for all my torque wishes - but MAY change the cam 'cause it'll be in a 407ci or 412ci engine. May just use my 1.7/1.6 ratio rocker arm set on the int/exh and use the tiny cam - can always change it !

    I was just using the cam quest dyno to compare torque curves - not design an entire engine. It did help kill a large block of my time ( I ran 3 or 4 engines thru it and most of their recommendations that i liked, but some were too absurd). I did the computer dyno thing about 14 years ago.

    The OP should cam according to what the cyl heads want also. I have a great set of ported heads here that will use a single pattern cam and I know that'll build some great midrange. That's very hard to do (port into the 80+% range) and still have real good intake flow to back it up.

    Hope this was still considered "on topic".

  2. #22
    Large Marge sent me SUBURBIAN's Avatar
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    Re: 383 cam choice

    I was suggesting that the OP join "us", with "us" being me and you, and the other fellas here on FSC that like small cammed engines.

    The heads on my old muscle car are better than 85%, and I run a single pattern lazy lobe old school flat tappet cam, and that engine pulls as hard at 2500 as it does at 6500. It is all in the heads. Always will be. I agree, absolutely, that the cam needs to match the heads. We know where vortec castings stop making power, and we know where the OP wants to stop making power. That is why we're telling him to build grunt engine.

  3. #23
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    Re: 383 cam choice

    Ok, cool, hard to tell online.

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    Re: 383 cam choice

    The isky cam seems a little bigger at 225/234 than the 2teens/2twenties you suggested. Would these numbers get smaller because its a 383 and not a 350? And its not split profile, but close. I am really thinking about the lun 60121.
    Last edited by tommey66; 02-16-2011 at 05:41 AM.

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    Re: 383 cam choice

    Quote Originally Posted by tommey66 View Post
    The isky cam seems a little bigger at 225/234 than the 2teens/2twenties you suggested. Would these numbers get smaller because its a 383 and not a 350? And its not split profile, but close. I am really thinking about the lun 60121.
    The numbers stay the same, and that is a split pattern cam.

    You have a manual trans and good gearing (as long as your tires aren't larger than 33's) and you could pull-off using the lunati 60121, but I wouldn't go any larger like the isky cam above.
    You may want to look at the lunati 54743LUN also. The 60121 may be alittle soggy in OD and low speed, maybe, but it shows a short intake seat duration of 270 and that helps it.

    EDIT : the Lunati 60121 webpage shows differant duration figures of the same cam : 221/229 @ .050 and 219/227 @ .050, my statement above was based on the larger figures - NOT the smaller set of values - 219/227. This makes the cam a little smaller than I originally thought and still perfect for what I'll need in my 407 or 412.

    This cam in perspective is in the middle between a 206* extremely torquey cam and a 232* upper midrange to topend cam. How much bottom-end power do you want ?
    Last edited by 68post; 02-16-2011 at 07:42 PM. Reason: to edit

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    Re: 383 cam choice

    The 60121 is as large as I am going to consider when I build my 412 and that engine is about the same amount larger than a 383 as a 383 is to a 350 !

    What's your tire height ?

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    Large Marge sent me SUBURBIAN's Avatar
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    Re: 383 cam choice

    I must have linked the wrong isky grind.

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    Re: 383 cam choice

    Sorry forgot the tire size the first time and wasted your guys time so far. My tires are 35/13.5/15 bfg krawlers. Will be needing tires by summers end and am probably going to 37's

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    Re: 383 cam choice

    What gears do you have now? What gears are you planning to run with the 37s?
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    Re: 383 cam choice

    456 gears, same for the 37's. might go to 513's but dont want to. Stock 5spd tranny
    Last edited by tommey66; 02-17-2011 at 11:44 AM.

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    Re: 383 cam choice

    Quote Originally Posted by The Fiddle View Post
    I'm running one step under that one:

    http://www.summitracing.com/parts/LUN-60120/


    In the 383, I love the off idle torque.
    This one sounds like a nice grind for the OP.
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    Re: 383 cam choice

    Quote Originally Posted by tommey66 View Post
    456 gears, same for the 37's. might go to 513's but dont want to. Stock 5spd tranny
    Have you thought about the limits with your 5 speed? Is it the NV3500? I assume so.
    Quote Originally Posted by Xander Berkeley
    I'd better make hay while the sun shines.

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    Re: 383 cam choice

    Yeah it is the nv3500 and I have really put it through some abuse. It takes 5500rpm clutch dumps on pavement repeatedly and seems to love them, the axles and u-joint are a different story. The 10 bolt is long gone.

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    Re: 383 cam choice

    You could always go with the 4500 if you need to later on.
    Quote Originally Posted by Xander Berkeley
    I'd better make hay while the sun shines.

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    Re: 383 cam choice

    This is another 1 up for smaller cams. Just for comparison, I built a flat tappet 383 for a guy with 9.5:1 CR and 906 heads and it made over 400ft lbs of torque from 2500 all the way to 5200rpm with the isky 274 mega grind cam. Suburbians right, horsepower wins bragging rights, torque wins races.

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    Re: 383 cam choice

    What about this one:
    SKU: 109671 Description
    Excellent low end and mid range torque and HP, good idle, daily usage, off road, performance and fuel efficiency, primarily used in 383+ ci.in. engnes, 2600- 3400 cruise RPM, marine applications: for mildly modified engines with high flow exhaust systems, for performance applications in light boats, 8.75 to 10.75 compression ratio advised. Good w/small supercharger, 8 lbs. maximum boost w/8.5 maximum compression ratio advised, .900� base circle for long stroke clearance.
    Part Number: 109671 Grind Number: HR-216/339-12.90 IG
    Engine Identification:
    Start Yr. End Yr. Make Cyl Description
    - - - - - - - - HR-216/339-2S-12.90 IG camshaft - Ch. 305 (5.0L)-350 (5.7L) V8 87-99
    Engine Size Configuration
    - - - -
    Valve Setting: Intake - .000 Exhaust - .000 Hot/Cold - HOT
    Lift: Intake @Cam 339 @Valve 509 All Lifts are based
    on zero lash and theoretical rocker arm ratios.
    Exhaust @ Cam 352 @Valve 528
    Rocker Arm Ratio 1.50
    Cam Timing: TAPPET @ .004
    Lift: Opens Closes ADV Duration
    Intake 28.0 BTDC 70.0 ABDC 278.0
    Exhaust 76.0 BBDC 30.0 ATDC 286.0
    Spring Requirements:
    Part Number 99846
    Loads Closed 125 LBS @ 1.800 or 1 13/16
    Open 342 LBS @ 1.300
    Recommended RPM range with matching components
    Minimum RPM 1600
    Maximum RPM 5800
    Valve Float 6500
    Cam Timing: TAPPET @.050
    Lift: Opens Closes Max Lift Duration
    Intake 1.0 BTDC 35.0 ABDC 107 216.0
    Exhaust 49.0 BBDC (5.0) BTDC 117 224.0
    Last edited by tommey66; 02-17-2011 at 07:06 PM.

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    Re: 383 cam choice

    Quote Originally Posted by tommey66 View Post
    Yeah it is the nv3500 and I have really put it through some abuse. It takes 5500rpm clutch dumps on pavement repeatedly and seems to love them, the axles and u-joint are a different story. The 10 bolt is long gone.
    Exactly which parts of the 10-bolt broke ? I'm picking up my '94 rcsb tomorrow and it's a 5 spd with a 10 bolt rear. I may go above & beyond just a rearend cover with bearing support studs.
    Thanks
    Last edited by 68post; 02-17-2011 at 07:08 PM. Reason: stupit - kunt spel

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    Re: 383 cam choice

    first one broke the ring and pinion, took every tooth off the pinion and about 15 teeth off the ring. Second one sheared the carrier right in half and shot the spiders out the cover. Didnt want to mess with the front diff. swap so I found a 14 bolt sf. and so far that has held up flawlessly.

  19. #39
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    Re: 383 cam choice

    After owning a StealthRam unit....and two cams in a 383...I can tell you a few things about the setup. One...the HSR just doesn't produce low end torque even with a 218/224 cam I ran the first time. Two, the torque band from 2800-5500 is very flat on cams with 112 or 114 LSA. I would recommend a cam on a 108 or 110 LSA and duration in the 224/230 area.....which was my second cam. The 224/230 in a 383 with the HSR peaked power about 5400 rpms and stopped pulling about 5800 rpms. So, I'd go 224/230 on a 108 or 110 LSA if you are looking for a power range of 3500-6000.

    Just my experience with the HSR.
    Last edited by YenkoST; 02-17-2011 at 09:08 PM.

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    Re: 383 cam choice

    Finally got an answer back from the"cam people" at comp cams this is what they say will work
    CCA-08-433-8
    UPC 36584025054
    Cam Style Hydraulic roller tappet
    Basic Operating RPM Range 2,500-6,000
    Intake Duration at 050 inch Lift 236
    Exhaust Duration at 050 inch Lift 242
    Duration at 050 inch Lift 236 int./242 exh.
    Advertised Intake Duration 288
    Advertised Exhaust Duration 294
    Advertised Duration 288 int./294 exh.
    Intake Valve Lift with Factory Rocker Arm Ratio 0.520 in.
    Exhaust Valve Lift with Factory Rocker Arm Ratio 0.540 in.
    Valve Lift with Factory Rocker Arm Ratio 0.520 int./0.540 exh.
    Lobe Separation (degrees) 110
    Computer-Controlled Compatible No
    Grind Number CS XR288HR-10

 

 
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