1. fratzog lover

    fratzog lover Well-Known Member

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    Before Competition Cams?
    I will say this. When I was shopping for a cam a few years back, I was calling them every week or so. And got a different recommendation from every cam "tech." Next time it will be a call to Racer Brown probably, and just have a cam ground for my engine.
     
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    • toolmanmike

      toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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      A few of the guys worked for other cam companies (Cam Dynamics comes to mind)
       
    • Mattax

      Mattax Just the facts, ma'am FABO Gold Member

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      First engine I bought came from RHS. Toward the end of when they did that sort of stuff. 1989-90 IIRC. Still have a catalog or two.
       
    • Wyrmrider

      Wyrmrider Well-Known Member

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      a well know quote was
      To be a successful cam company never open the dyno door
      I remember when Edelbrock first showed dyno reports on the 383 and 440 manifolds
      Turned out that they only had one motor and "dry labed" the other
      I forget which
      you sell what you tell even if it's BS
       
    • AJ/FormS

      AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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      that happened to me as well, in 2004, from a different company. I went back and did some learning, took a chance on a Hughes and am sorta satisfied; but if I ever buy another cam, it will be a solid FT.
       
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      • fratzog lover

        fratzog lover Well-Known Member

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        Ditto.
         
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        • Mattax

          Mattax Just the facts, ma'am FABO Gold Member

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          Sorry I haven't had time to think about this.

          You guys will have to help explain all the pencil notations.
          But here's my first take away.
          OCG shows the duration at .006 tappet as close to the FSM.
          SAE is 0.004 at the lifter, and dynomation calculates based on .006 at the valve.
          OCG didn't measure at .004, but we can see the .004 will be between the .002 and the .006 durations. So that confirms what we were saying earlier.
           
        • Wyrmrider

          Wyrmrider Well-Known Member

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          OCG shows the duration at .006 tappet as close to the FSM - not close
          FSM is more like.008 at the cam like Engle
          SAE is .006 at the valve which is .004 only with a 1.5 rocker
          .004 will be somewhere between the .002 and OCG gives but hard to say where
          factory cams get longer the lower the measurement
          340 cam is like a 280 class crane or cam dynamics or Summit, sealed power, elgin etc .004
          or a 270+ comp lunati or other .006 cam

          340 68 auto and 360HP cam
          279/289 @.004 429/444 114LCA
          268/276 @.008
           
          Last edited: Nov 1, 2019
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          • 1971 CY Dodge Dart

            1971 CY Dodge Dart Dart Swinger FABO Gold Member

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            Bumping this back up as it had some helpful information for me. Here is my cam card I got with the car so it looks like the cam is essentially a "stock" 340 cam. It's an Erson cam I couldn't find on their website.

            IMG_0682.jpg
             
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            • Mattax

              Mattax Just the facts, ma'am FABO Gold Member

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              Thanks for sharing the Erson card.
              Interesting that it says the opening and closing degrees are at 0.005" lift
              Maybe Wyrmrider, TMM or one of the orther guys has some insight into Erson's specs.
              My guess is Erson had the cam ground by another company (one of those big cam companies Wyrm has mentioned) and then Erson just filled in the cam card using the Chrysler shop manual specs. They might not have even realized the open and closings were not measured from lifts. For the .050 I don't know but probably are the numbers they got from the grinder.
               
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              • toolmanmike

                toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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                All I have to say is the OEM's and aftermarket sure screwed things up by not having a industry standard for cam specs.
                 
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                • 1971 CY Dodge Dart

                  1971 CY Dodge Dart Dart Swinger FABO Gold Member

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                  I actually question if that Erson cam is still in my car. One of the previous owners that I spoke to had the motor built with that cam. He said the car never loped like it does now. The only changes made after him were the mufflers I believe. I’m still trying to piece everything together as far as the car is concerned and what I have. I thought I had 3.91 gears but I actually have 3.23’s.
                   
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                  • fratzog lover

                    fratzog lover Well-Known Member

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                    Aint that the truth. Apples and cantaloupes.
                     
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                    • fishy68

                      fishy68 Tyr Fryr's Inc.

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                      Ain't that the truth!
                       
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                      • Dicer

                        Dicer Back Bone beats Wish Bone all the time. FABO Gold Member

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                        of any use...

                        4831386-MVC-006S.JPG
                         
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                        • crackedback

                          crackedback FABO Gold Member FABO Gold Member

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                          Those are NOT the camshafts specs installed in the 68-71 340's. They were all split duration cams.

                          I guess if you want to throw exh lift out there as lift... OK on the one.
                           
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                          • fratzog lover

                            fratzog lover Well-Known Member

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                            .429/.444?
                             
                          • crackedback

                            crackedback FABO Gold Member FABO Gold Member

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                            Pretty much. The 68 4 speed cam had the smaller cam exh lobe as intake 276-445, and put the 440 284-458 cam intake lobe on the exhaust side, IIRC.

                            Plenty of info that is not correct and been printed in books for years.
                             
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                            • yellow rose

                              yellow rose Overnight Sensation FABO Gold Member

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                              That’s a FACT.
                               
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                              • fratzog lover

                                fratzog lover Well-Known Member

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                                Agreed!
                                 
                              • 65 Cuda 340

                                65 Cuda 340 FABO Gold Member FABO Gold Member

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                                CamCraft-factory hi-po cam specs.png

                                Info from Camcraft
                                 
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                                • AdamR

                                  AdamR Big Member

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                                  No one one mentioned the NHRA specs which is .463"/.473" lift.
                                   
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                                  • dusmon

                                    dusmon Well-Known Member

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                                    same as in the 1980 direct conection manual just read it
                                     
                                  • VOETOM

                                    VOETOM Well-Known Member

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                                    65, the two Pontiac cam specs they provided are reversed. The 041 is the larger of the two. :):)
                                     
                                  • 65 Cuda 340

                                    65 Cuda 340 FABO Gold Member FABO Gold Member

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                                    DAMN! That completely messes up my Pontiac build!

                                    OK, just kidding, thanks for the info. :poke:
                                     
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