what cam shaft are you running on the street

Engine, Trans & Driveline

  1. Gary Lowry

    Gary Lowry Active Member

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    Just got the 67 Belvedere and want a little more lope. She's a 30 over 440, headers, ign. tricked out AFB with an Isky 256 stick. Has tons of bottom end (as most do) but lays down about 5000. And that is OK I have been fast before, I want a good bumpy cam. I'm looking at the Mopar Purple 484/284. Watch you got.
     
  2. Zeppelin264

    Zeppelin264 Well-Known Member

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    Lunati 60304. Lumpy, good all around cam. Pulls good to 6,100 rpm as far as I know.
     
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    • Kern Dog

      Kern Dog FBBO Gold Member FBBO Gold Member

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      Skip the 284/484. It sounds good but is not that great of a performer. I had a basically stock 440 with the MP 280/474, it ran great. Later I built a 9.5 to 1 440 with the 284/484. Rougher idle (which was fine by me) But not much of an improvement in power. The 292/509 cam is actually a decent street cam if you have the gears and converter for it. I ran that one for years in my 440/493. I also ran 2 different Comp Cams XE 285 HL cams. Great performance until BOTH went flat. One within 2 months, the other in about a year.
      I went with the Lunati 316/326 solid and was amazed at the power and the racy idle but since I don't race the car, the cam was pulled so I could make the car more street and cruise friendly. I now have the MP 528 solid. It idles smoother than the Lunati or the MP 509 but has a slight edge in power over the 509. I never was interested in solid flat tappet cams until the popularity of the direct oiling lifters. These shoot a stream of oil through the lifter to the cam lobe. I like the extra assurance these lifters give to reduce the risk of cam failures.
       
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      • wyrmrider

        wyrmrider Well-Known Member

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        Isky 256 is a Chevy cam, so are the Megacams
        really lazy compared to today's cams
        The Purple cams are all better than chevy type masters but still not current
        for example Mike Jones 256 hyd cam has .305 lift at the cam- compare that with your Isky
        now the good news is that the Isky can be installed under the shade tree and will last a long time- it's that easy
        the megacams rev like crazy and work good on the top end (the 310) but you give up low end
        are you thinking solid?
        do me a favor and post up your head flows- don;t know go to the Stan Weiss site and find something comprable
        BTW pocket porting mopar heads helps a bunch
        you want rump de rump or power- poke a hole in you muffler :)
        seriously Mopars do NOT like overlap your intake blows out your exhaust so mileage sucks- even with a cam with Magnum timing- and your exhaust runs hot (hotter)
        also your center two exhaust valves overheat (the valves cool mostly on the seat not through the stems)
        need your compression- you have 915 heads? they flow like 906 from 68 but have a smaller chamber
        so do you have stock compression? Is this an HP motor what gears and stock converter?
        THink EDM lifters if you go flat tappet hyd or solid
        What springs or new?
        Rockers?
        So we have to know is this a stock 67 compression 440 standard or HP or has it been rebuilt- can't guess on 50 year old Iron
        cheers
        don't know post up your cranking compression or post it up anyway
        I'm thinking with that short Isky cam your compression must have been lowered somewhere along the line or it would be pinging even on premium
        In anycase picking the cam timing- open and closing points comes first
        I did cam and radiator testing for Chrysler in the 70's
        One size bigger than the "268" Magnum cam was real close or lost on 60 foot times (stock gears and converter) ( the non magnum cam was 260 in mopar method- YOU CANNOT COMPARE MOPAR NUMBERS WITH ANYTHING ELSE WITHOUT A CAM DOC
        but you can compare Mopar numbers with other mopar numbers
        That 284 was a fine cam but needs gears and converter, works with headers but likes high compression
        remember it was designed back when springs were not as good as today so leaves some cam acceleration on the table
         
      • rumblefish360

        rumblefish360 Well-Known Member

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        Ken dog’s 280/480 suggestion was s a good day be IMO for the purple cam line. IF you can find it cheap. It is more in a similar but slightly higher rpm range of your “Fall in its face @ 5K” cam.
        Any new cam grinds are equal or better to the older purples.

        A “bumpy cam” comes not from the duration but more from how the timing events are occurring. Your typical muscle car cam and s on a 110 centerline. A more radical question doe wwould op be on a 108. A race weight idle sound will be on a 106 or lower.

        You can call up the cam company you want to use and ask that the cam be moved down to a 108 which will help bottom end torque.

        There is also the Thumper line from Comp Cams. Howard’s has there line as well. Mild cams with race like idle chopping sound while remaining nice and ez to drive on.
         
      • Mebsuta

        Mebsuta Well-Known Member

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        I use 213/225 @ .050, .450/.458 115 LSA. That's the factory hp camshaft. It doesn't have the Dairy Queen idle, but it doesn't need high spring pressure or special motor oil, so I don't worry about it.
         
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        • rumblefish360

          rumblefish360 Well-Known Member

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          That is NOT the factory hp camshaft. The factory OE cam is larger and the MP factory offered purple shaft is even larger.
           
        • Mebsuta

          Mebsuta Well-Known Member

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          Yes it is.
           
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          • rumblefish360

            rumblefish360 Well-Known Member

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            I’m pretty sure your duration @ .050 is off.
             
          • Mebsuta

            Mebsuta Well-Known Member

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          • 1967coronet440

            1967coronet440 FBBO Gold Member FBBO Gold Member

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            Here’s the .284/.484 sounds good, doesn’t perform for shit. Had it on my 67 440 with performer intake, Holley 750, Hedman headers, 906 heads. Basically a stockish cam with more lope.


             
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            • wyrmrider

              wyrmrider Well-Known Member

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              "but more from how the timing events are occurring."
              Lobe centerlines must be a result- not an input
              It's not squeezing the lobe centers together that gives more low end- it's advancing the intake
              and there you have to watch your dynamic compression to avoid pinging
              What you don't want to do is to increase overlap unnecessarily- which is what squeezing the LCA does
              Mopars run hot with overlap and your intake charge gets blown out the exhaust
              so what to do?
              open the intake later but use a higher acceleration master and/or a higher ratio rocker and close the intake where you would with that squeezed LCA
              More with low compression
              exhaust is not quite so critical but timing should be designed, not just the LCA spread
              cheers
               
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              • wyrmrider

                wyrmrider Well-Known Member

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                "I use 213/225 @ .050, .450/.458 115 LSA. That's the factory hp camshaft."
                That is about right for a Magnum cam
                "BradH and others have measured it. It's nearly identical to Speed Pro CS-661, Elgin E-1094-P, etc. "
                yup- same cam
                Duration at .006 292/309 (SAE method .006 AT THE VALVE) or .004 at the cam with 1.5 rockers
                Chrysler says 268 on the Intake
                why the difference?
                Chrysler has a unique yet consistent way of measuring duration. They take the blueprint point where the clearance ramp meets the acceleration ramp and add 4 degrees to the opening and 4 degrees to the close
                I basically agree with 67 coronet 440- you can do better today
                but 268 and 284 - the 284 is 16 degrees bigger
                and the 284 is reasonably lazy and the 268 MAgnum is really lazy- so much so a fast chevy grind will look about the same
                HOWEVER the MOPAR grind uses most of the .904 lifter EASILY whereas the Chevy grind would only use a .842 worth of the .904 but radically
                Result- the MOPAR method wears better
                 
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                • rumblefish360

                  rumblefish360 Well-Known Member

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                • wyrmrider

                  wyrmrider Well-Known Member

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                  From a post I made in 2015
                  I dug into Howard's catalog a little further- I'm a paper catalog guy but I did find several Hyd grinds with "cam note" 15 which indicates special for .904 MOPAR lifter-
                  as with comp there are not any real short ones similar in duration to Dodge Magnum (there may be now)
                  Howard 720931-11 220-220 .506 lift at 108 lc and recommend 104 icl shortest .904 grind in Howard cat

                  Engle K58 224 .506 short seat timing

                  Comp XE275HL 231 .525 shortest .904 grind in Comp Cat 2015
                  crane none
                  Lunati Voodoo 220-226 475-494 note the loss of .030 lift compared to Howard
                  Lunati voodoo 226-234 494-513

                  The Bullet .904 list is here
                  http://www.bulletcams.com/Masters/HClobes.htm
                  Bullet 214 480 similar intake duration to Magnum but more lift
                  Bullet 220 500
                  IDK if MikeJones has a range of .904 grinds- worth filling out his recommendation form and find out
                  http://jonescams.com/street-performance/
                  especially if you are thinking solid or HR or Solid Roller
                   
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                  • 6t4polara

                    6t4polara Well-Known Member

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                    Bob K's 6 pak cam.
                     
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                    • 440+6

                      440+6 FBBO Gold Member FBBO Gold Member

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                      The mopar 484 is ok for an upgrade from stock, decent midrange, I used one for years and liked it fine.
                      Switched to a bob k cam and never looked back.
                      BTW, I still have the low milage 484 with lifters and tming set if interested ( thought I would use it again but probably won't).
                       
                    • HT413

                      HT413 Semi Pro Bowler FBBO Gold Member

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                      • lewtot184

                        lewtot184 FBBO Gold Member FBBO Gold Member

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                        mopars current .050" rating is way off. the factory cams aren't even the advertised 268/284.

                        I have two cars. one stock 440 with the 272/.455 mopar and the other has a modified engine with an engle k65 solid. a moderate solid will do everything a performance hydraulic can do and more.
                         
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                        • not so famous bob

                          not so famous bob Well-Known Member

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                          292 extreme solid roller .