340 cam help needed

Small Block Mopar Engine

  1. bill340S

    bill340S Member

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    This COVID-19 stay at home order has allowed me to get back to assembling a '69 340. The body is '69 Barracuda S fastback, 727, 3:23, 245R60/15 rear tires. Engine is rebuilt 020 over short block 9.5 compression, 69cc X heads with bowl work/steel exh. seats and slight clean-up cut. I need to decide which cam; I have a new MP P4452761 268/272 - 228/231 @ .50 lift with matching springs. But this is a very old cam design compared to the current cam offerings. In order of personal preference, I'm looking at the comp. cams 268AH...270magnum...XE262H. Yes, I know the XE268 is a popular 340 cam but I don't like the spec's of this cam for an automatic with power disc brakes.
     
  2. RustyRatRod

    RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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    I like the MP grind. It's not as archaic as you think. That whole line was redesigned in the late 80s to take advantage of the .903 lifter diameter. I know......it was the 80s but still......
     
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    • cudaracer

      cudaracer Well-Known Member

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      I am considering using the same 268AH cam with my 340, 904 and 3.23 gears. I have power steering and power disc brakes as well. I want this is a mildly hot street cruiser, that the wife will drive from time to time. Am I considering the wrong cam?
       
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      • crackedback

        crackedback FABO Gold Member FABO Gold Member

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        The 268 will run fine with power brakes and a solid idle tune up. It needs 14-18 initial timing to get the tune up right in most every case.

        Look at the voodoo 02 cam as well. The MP grind works too since you already have it. I prefer the voodoo 02-03 cam over the MP.
         
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        • AJ/FormS

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

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          IMO
          If yur gonna run a hydraulic268 at 9.5Scr, yur gonna need more than 3.23s and a 2400TC to get off the line decently. Oh wait never mind, the 245s will take care of that.
           
        • Wyrmrider

          Wyrmrider FABO Gold Member FABO Gold Member

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          268 or any voodoo out performs the comp XT line (no matter how you define "perform"
          Use a Lunati one or two sizes shorter
           
        • Wyrmrider

          Wyrmrider FABO Gold Member FABO Gold Member

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          The DC 268 has more seat duration than the comp more like a 275 comp or lunati so decide on the rev range you want\I'd say the compression is ok for the mp but it might like more gear and so would the 268 chevy cam ib a mopar box from comp
          that said it has a fatter nose so they wear well
          you want a more modern cam go lunati or howard
          xe line is popular due to the heard mentality- you can do better
           
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          • AJ/FormS

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

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            Really! Wow; that says a lot right there.

             
          • bill340S

            bill340S Member

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            I get the joke!
             
          • bill340S

            bill340S Member

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            Let's put it this way...I don't think you can go wrong with the comp 268AH. It's a nice step up from the stock 340 cam which is pretty mild. And a bit more lift than the new (old) MP cam I have.
             
          • AJ/FormS

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

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            I suddenly realized that this might sound facetious to some guys; it was not meant to. It was meant as an AHA-moment; as in aha I learned something new here. I'm always learning new stuff from Wyrmrider, who has a wealth of cam data.
             
          • Wyrmrider

            Wyrmrider FABO Gold Member FABO Gold Member

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            the 268 276 stock cam has more duration than the comp 268 chevy cam
            the comp has closer lca so it feels stronger down low and midrange
            just moving the deck chairs around on the Titanic
            the Lunati 268 IS a step up
            but since it is a better grind you can use a 262 Lunati and still have more cam without oosing your low end (or even the 256 lunati) (or howard)
             
          • A56

            A56 MoParAffliction FABO Gold Member

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            Hmmm nice recovery:poke:
             
          • AJ/FormS

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

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            I get that joke,lol.


            But the following one went over my head, yur gonna need to dumb that down for me.
             
          • QuickDart360

            QuickDart360 Well-Known Member

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            The mopar cam is actually better than the other cams listed. Lunati or racer brown are the better ones. Also crower is a good choice. But since you got the mopar cam I would use it over the ones mentioned.
             
          • 512Stroker

            512Stroker We are all here because we are not all there.

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            Who's hydraulic lifters are you gong to use?
             
          • AJ/FormS

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

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            A 228*.050 is a nice sized streetcam.
             
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            • QuickDart360

              QuickDart360 Well-Known Member

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              Crower cam saver lifters are a good choice. If the mopar cam is the kit then the mopar lifters work good too.
               
            • Wyrmrider

              Wyrmrider FABO Gold Member FABO Gold Member

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              The 262 MP cam is one of the newer ones
              new being relative
              much better than the 268 comp about the same seat duration
              Expensive compared to Lunati and Howard etc
              I would not buy one new
              but if you have it- run it
              It is NOT a fast rate cam
              the 268 comp is, but over a much smaller effective lifter diamater
              lube saver lifters- good idea
              I wonder why Howard has them for chevy but not for mopar
              right now I only know of Crower and Rhodes
              any others?
              easy to DIY
               
            • 512Stroker

              512Stroker We are all here because we are not all there.

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              Do you require a high volume oil pump when you use the Crower cam saver lifters?
               
            • QuickDart360

              QuickDart360 Well-Known Member

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              No they work with stock oil pump or high volume.
               
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              • Wyrmrider

                Wyrmrider FABO Gold Member FABO Gold Member

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                someone makes a chevy liftr with two flats they say HV pump but IDK
                some are made so the flat does not go all the way to the bottom of the lifter
                only lubes when on the base circle
                Our Jag XKE had drilled camshafts with the hole right before the opening ramp
                wonder why I never tried that on a ohv motor
                should not be that hard to get lube into the center of the cam
                 
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                • rumblefish360

                  rumblefish360 So close, yet so far away FABO Gold Member

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                  Don’t use Comp Cams lifters. After cam break in...

                  73BC9D2F-CF2C-4452-B8D0-DFF3D34D3828.jpeg 8D51CE33-BEB1-49DD-8FF8-37056C2DA1B6.jpeg
                   
                • QuickDart360

                  QuickDart360 Well-Known Member

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                  I don't use comp anything! I'll use mopar performance or anything else.
                   
                • Wyrmrider

                  Wyrmrider FABO Gold Member FABO Gold Member

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                  Mopar performance changes vendors
                  not always for the better\
                   
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