408 Cam on the way

Small Block Mopar Engine

  1. j par

    j par Well-hung Member

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    I have brass or had brass shift forks in there and at the time I was doing a lot of drag racing so I felt it a good upgrade to put steel shift forks in...
     
  2. lead69

    lead69 hopeless car junkie

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    It could be a while so I'm sure we will be hanging out before then man!.
     
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    • j par

      j par Well-hung Member

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      I think you're going to be absolutely perfect with your cam. you didn't just buy something off the shelf or something off the internet but you talk to a cam grinder who listen to exactly how you wanted your car to run and he'll likely give you what you want and the word here is for you...
       
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      • Wyrmrider

        Wyrmrider FABO Gold Member FABO Gold Member

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        Sorry your thread got sorta hijacked Idaho
        but you started it mentioning Thumper in the first thread
        IMHO you are much better off with your cam than you would be with a thumper cloan
        keep us posted with results
        all the best
         
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        • Idaho

          Idaho Well-Known Member

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          I'm fine with all the comments. Thanks for your feedback.
          I have the cam in hand now.
          I'd like to get opinions on the install. Four degrees advanced or straight up?
          I don't have a timing chain yet so advice on that too.
           
        • Wyrmrider

          Wyrmrider FABO Gold Member FABO Gold Member

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          does it not have 4 degrees ground in alredy??
          if you are near max recommended compression range I would bit advance it
           
        • Idaho

          Idaho Well-Known Member

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          That's a question I have to ask Ken. He's not available today.
          I'll attach the specs. I don't know if that tells you?

          6CC5FDF3-B5C1-4646-9508-64391781AD86.jpeg
           
        • Idaho

          Idaho Well-Known Member

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          Now that I'm looking at it I'm wondering if I got the wrong cam.
          The specs say 1341 when I ordered a 1357. This is a smaller cam.
           
        • Wyrmrider

          Wyrmrider FABO Gold Member FABO Gold Member

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          cam card says 108 Lobe centerline angle LCA
          104 intake centerline ICL
          so it's ground 4 degrees advanced
          this is not to say you can stick it in dot to dot and have it come out @104
          not on my experience with regrinds unless ken was able to fit the new lobe and keep the keyway in the same place
          also Ken gave you the .050 timing
          so ask him if he wants you to use the at. 050 tappet lift timing or the measure down both side of the lobe and split the difference to get the nose center 104 method
          with asymetrical cams it can make a big difference
          also with an asymetrical cam how far down you go to take your measurements makes difference
          so 9.8 compression???
          what heads do you have flows?
          cc'd heads?
          gasket cc
          piston cc's valve notches
          deck clearance?
          all checked?

          let''''''s ask the forum
          Would Idaho be ok with a comp 275 H cam? on a 108

          remind me gears weight usage etcnow I'm really sorry we hijacked your thread
          but let's try for some answers before calling ken
           
          Last edited: May 2, 2020
        • j par

          j par Well-hung Member

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          I'm sure this is the first question I asked on page one but is it a solid lifter Cam and hydraulic lifter cam a roller cam?
           
        • j par

          j par Well-hung Member

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          Well through research I figured it's got to be a roller hydraulic cam? And yes it looks like you got the wrong one...
           
        • Idaho

          Idaho Well-Known Member

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          Yes it's a hydraulic roller.
          The machine shop helped with setting it up for a 9.8 SCR. I did the head cc at 62 cc, and he verified. I don't recall the other details.
          Thanks for that clarification wyrmrider, I wasn't sure how to determine how it was ground.
          I'll be in touch with Ken. Must have been a crazy day at the shop. Maybe Covid 19 related :(
          I suppose I could change to anything now.

          56CC7BED-E50B-473A-963C-9166587121DC.jpeg
           
        • Cal Tonsley

          Cal Tonsley Well-Known Member

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          Not so sure about the Thumpas but love that P51 Mustang - my uncle flew these with the RAAF in Korea!
           
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          • j par

            j par Well-hung Member

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            Yep it looks like he's going to have to take a touch more off the base circle..
             
          • j par

            j par Well-hung Member

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            I assumed you were waiting for the cam for the pushrods to be ordered..
             
          • Idaho

            Idaho Well-Known Member

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            Yes, I have an adjustable pushrod to be used for that purpose.
            I'd like suggestions for a timing chain.
             
          • j par

            j par Well-hung Member

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            A quality double roller with several grooves for different timing on the bottom crank sprocket will do
             
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            • j par

              j par Well-hung Member

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              You certainly don't need to break the bank but don't go cheap..
               
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              • mbaird

                mbaird mbaird

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                First off ... I am no cam expert .
                But dont the ramps look really slow for a roller cam ? 218 @ .050 and 293 @ .002
                I am running one of Kens cams in my 5.9 and have a similar ramp .

                Am I looking at this wrong ?
                 
              • Idaho

                Idaho Well-Known Member

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                Comments welcome. I'd like to know.
                 
              • Wyrmrider

                Wyrmrider FABO Gold Member FABO Gold Member

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                9.8 reacompression you might be more than ok with the current cam
                depending on your gearing and rev range you want
                you would have a bunch more dynamic compression which is good unless too much
                see if ken will let you test it
                where's aj when we need him
                 
              • Idaho

                Idaho Well-Known Member

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                230/236 @ .050ā€, 284/290 adc, .515ā€/.515ā€ lift (1.6:1 rocker), 108 sep vs
                218/224 @ .050", .478"/.478" lift (1.6:1 rocker), 108 sep

                I'm not advanced in understanding camshaft effects but I'll try.
                Am I right thinking the smaller cam will have less idle lope, shine at a lower RPM, broad torque band, drop off HP as RPM rises and have lower peak HP?
                I plan to rev limit around 5500, maybe 6000.
                I want to have tire roasting torque without clutch dumping but with a .410 gear I think the bigger cam likely has enough to light up th 285/40/18s?
                I feel like maybe the smaller one will choke the overall balance of performance, wasting some of what has been put into it.
                And as noted, I like a lopey idle.
                 
              • lead69

                lead69 hopeless car junkie

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                That is a very small cam imo for a 408 with decent compression,the power range would be off idle to about 5k. If that's what you are looking for that's great but it is a big difference from what you had initially planned on. As far as timing chains I have used a bunch of the summit billet chains and the regular summit double rollers with great results, they all had good tension out of the box which can be spotty on allot of the chains out there.
                 
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                • Idaho

                  Idaho Well-Known Member

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                  Looks like right cam wrong spec sheet, per Ken.
                  I will verify when degreeing.

                  Ken suggested 2 degree advance, citing potentially too much cylinder pressure with 4 degrees. Iā€™m not sure about finding a chain/gear set to do that. I may see how the pistons sit in the deck then decide.

                  9D5F45C2-5267-4FE3-96D4-600DBF392E6C.jpeg
                   
                  Last edited: May 4, 2020
                • Wyrmrider

                  Wyrmrider FABO Gold Member FABO Gold Member

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                  great news
                  if your compression is near max then straight up
                  if on the low side then +2 or +4
                  not including any ground in advance
                  because the timing slot is almost certainly not in the right place
                  now did you ask him about measuring down from the top of the lobe and splitting the difference to find the center
                  if so how far down
                  or check the .050 timing
                  do you think both will be the same?
                  let us know
                   
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