Isky 270 Mega Cam P/N 390171

Small Block Mopar Engine

  1. 69Chrgr

    69Chrgr Charger/Cuda

    Messages:
    415
    Likes Received:
    3
    Joined:
    Jan 29, 2007
    Location:
    Midlothian, Texas
    Local Time:
    11:36 AM
    Does anyone have any experience with this cam in a 340 stroked to a 416?

    Thanks
    Darren
     
  2. yellow rose

    yellow rose Doctor of Thinkology.

    Messages:
    18,813
    Likes Received:
    14914
    Joined:
    Jun 19, 2015
    Location:
    Living on the razors edge
    Local Time:
    9:36 AM

    If you want a shift speed of maybe 5200 that's will be ok.

    That's a bunch of engine for a small cam.
     
    • Like Like x 2
    • Thanks! Thanks! x 1
    • Agree Agree x 1
    • Wyrmrider

      Wyrmrider Well-Known Member

      Messages:
      1,960
      Likes Received:
      904
      Joined:
      Sep 5, 2016
      Location:
      los angeles
      Local Time:
      9:36 AM
      we sold lots of Isky Mega cams and were a WD/ Perf Engine rebuilder
      they rev well-you can miss a shift or over rev at the end of a straight (usually with the 310) without hurting anything
      they are specked funny like measuring at .010 on the opening side and.009 on the close
      or something like that
      what that boils down to is that they are really long on the seat compared to even an Engle or MP @.008 or COMP/LUNATI @ .006 that 270 would be like a 280+ crane
      they have little lift for the duration seat duration is long for the .050
      they are mild so they have few warranty problems
      they are universal- one grind fits all makes and models (I'd sell one to a DIY under a shade tree in a minute)
      spend all that money on a stroker best to get a custom cam
      do you have air flows, true compression, intake and carb, exhaust and all the info and post it back
      and think SFT
      however if you already own one try it and make good notes
      where do you want your power curve? same place but more- or what?
      what's the cranking compression with it
       
      • Like Like x 1
      • Agree Agree x 1
      • americal

        americal Well-Known Member

        Messages:
        70
        Likes Received:
        20
        Joined:
        Apr 29, 2016
        Location:
        arkansas
        Local Time:
        11:36 AM
        what would be a good cam for a 340 stroker?
         
      • RustyRatRod

        RustyRatRod 30 Degrees Outta Whack FABO Gold Member

        Messages:
        56,320
        Likes Received:
        25233
        Joined:
        Jun 7, 2010
        Location:
        Georgia
        Local Time:
        12:36 PM
        "WHAT ALL ELSE" is in the engine?
         
        • Thanks! Thanks! x 1
        • americal

          americal Well-Known Member

          Messages:
          70
          Likes Received:
          20
          Joined:
          Apr 29, 2016
          Location:
          arkansas
          Local Time:
          11:36 AM
          scat stroker for 340. 418 cid edelbrock heads. 10.to1 compression. stock hipo exhaust manifolds. I just want to have a cam that makes good power for my combination. I don't want to chang convertor.
           
        • yellow rose

          yellow rose Doctor of Thinkology.

          Messages:
          18,813
          Likes Received:
          14914
          Joined:
          Jun 19, 2015
          Location:
          Living on the razors edge
          Local Time:
          9:36 AM

          Then you'd better call someone and have a cam ground. No offense, but why build an engine that big and ring it's neck with junky assed exhaust manifolds? Doesn't make sense.

          And, you spent for the nice engine but you don't want to front for a converter?? Another I don't get it.

          I'm just trying to get my head around your thinking. Maybe I'm just not getting it. But the cam/converter issue should have been sorted out long before anything else.
           
          Last edited: Nov 23, 2019
          • Like Like x 1
          • Agree Agree x 1
          • RustyRatRod

            RustyRatRod 30 Degrees Outta Whack FABO Gold Member

            Messages:
            56,320
            Likes Received:
            25233
            Joined:
            Jun 7, 2010
            Location:
            Georgia
            Local Time:
            12:36 PM
            And how do we know what converter is THERE NOW? Aluminum heads with exhaust manifolds. Might as well put a stock 318 cam in it.
             
            • Agree Agree x 2
            • Like Like x 1
            • americal

              americal Well-Known Member

              Messages:
              70
              Likes Received:
              20
              Joined:
              Apr 29, 2016
              Location:
              arkansas
              Local Time:
              11:36 AM
              stock convertor. 340 hipo exhaust manifols work damn good.
               
            • RustyRatRod

              RustyRatRod 30 Degrees Outta Whack FABO Gold Member

              Messages:
              56,320
              Likes Received:
              25233
              Joined:
              Jun 7, 2010
              Location:
              Georgia
              Local Time:
              12:36 PM
              Both work pretty good on a stock 340.
               
              • Agree Agree x 1
              • 12many

                12many Well-Known Member

                Messages:
                798
                Likes Received:
                933
                Joined:
                Dec 14, 2016
                Location:
                South Carolina
                Local Time:
                12:36 PM
                OK, you have what you have, who cares as to the reasons why. So.........What rocker arms you running? Cam type preference? Any type you want for whatever reason....doesn't matter. What are the valve spring specs? (Closed and open pressure, installed height max lift etc) How's that for a start? Next.........
                 
                • Thanks! Thanks! x 1
                • RustyRatRod

                  RustyRatRod 30 Degrees Outta Whack FABO Gold Member

                  Messages:
                  56,320
                  Likes Received:
                  25233
                  Joined:
                  Jun 7, 2010
                  Location:
                  Georgia
                  Local Time:
                  12:36 PM
                  I gave up when I had to ask more than one question. People like this ask open ended questions expecting good answers with almost ZERO information and then we have to ask what all is in the combo? Horse shit. I got better things to do than pull teeth from someone who should have included all the useful information to begin with.
                   
                  • Like Like x 1
                  • Agree Agree x 1
                  • 12many

                    12many Well-Known Member

                    Messages:
                    798
                    Likes Received:
                    933
                    Joined:
                    Dec 14, 2016
                    Location:
                    South Carolina
                    Local Time:
                    12:36 PM
                    I know, just figured what the heck. I'm thinking it might be interesting to see what cam would be recommended for whatever the setup is.....even if the combo made no sense to some. Pinned down in the house all day due to nonstop rain......yup, absolutely nothing better to do:rolleyes:
                     
                    • Like Like x 1
                    • americal

                      americal Well-Known Member

                      Messages:
                      70
                      Likes Received:
                      20
                      Joined:
                      Apr 29, 2016
                      Location:
                      arkansas
                      Local Time:
                      11:36 AM
                      this is what I have. 418 stroker.edelbrock heads 65cc.i have a comp cam 268 xe that lifters went bad. the cam needs to be replaced. I have comp adjustable rockers.750 carb.4.10 gears 727 trans. the reason I don't run headers is because I bought this car new and I ran headers for many years but I am 70 years old and just tired of messing with them. the stock manifolds work just fine.i will not buy another comp cam.
                       
                      • Like Like x 1
                      • RustyRatRod

                        RustyRatRod 30 Degrees Outta Whack FABO Gold Member

                        Messages:
                        56,320
                        Likes Received:
                        25233
                        Joined:
                        Jun 7, 2010
                        Location:
                        Georgia
                        Local Time:
                        12:36 PM
                        I can come up with lots of good recommendations, but I'm growing tired of having to beg for help to give help.
                         
                      • americal

                        americal Well-Known Member

                        Messages:
                        70
                        Likes Received:
                        20
                        Joined:
                        Apr 29, 2016
                        Location:
                        arkansas
                        Local Time:
                        11:36 AM
                        well recommend something. its red with with black stripes. what else do you need to know?
                         
                        • Like Like x 2
                        • lead69

                          lead69 hopeless car junkie

                          Messages:
                          1,153
                          Likes Received:
                          225
                          Joined:
                          Nov 5, 2006
                          Location:
                          Vancouver,Wa
                          Local Time:
                          11:36 AM
                          Like YR said I would call and have a custom cam made for the combo,especially with a stock convertor and exhaust manifolds. Most will probably recommend something with split duration on a 112 lobe seperation if I had to guess. There are quite a few of off the shelf cams that will work but you won't spend that much more to get a custom, I would also call a few different companies and see what they recommend.
                           
                        • ir3333

                          ir3333 Well-Known Member

                          Messages:
                          4,430
                          Likes Received:
                          1022
                          Joined:
                          Jun 1, 2008
                          Location:
                          ontario,canada
                          Local Time:
                          11:36 AM
                          you guys might find this interesting.
                          450 hp ..426 ci.
                           
                          • Like Like x 1
                          • yellow rose

                            yellow rose Doctor of Thinkology.

                            Messages:
                            18,813
                            Likes Received:
                            14914
                            Joined:
                            Jun 19, 2015
                            Location:
                            Living on the razors edge
                            Local Time:
                            9:36 AM

                            Where did you get 450 HP. Didn't watch all the way to the end, but got close enough.

                            I can tell you that I don't tune like Nick. No way on Gods green earth was 34 total optimal with that head and the junk plug location. That thing should have been at 38 minimum. So there's that.

                            Then there is the cam timing issue. He didn't change the cam for the headers, and since the customer wanted manifolds the cam should have been ground for that. So it's dead wrong for headers. I'm betting that cam was on a 112 LSA and that is a header killer and helps exhaust manifolds.

                            I always like watching Nicks videos. He must pay a ton of money for all that editing, unless he's good at it.
                             
                          • ir3333

                            ir3333 Well-Known Member

                            Messages:
                            4,430
                            Likes Received:
                            1022
                            Joined:
                            Jun 1, 2008
                            Location:
                            ontario,canada
                            Local Time:
                            11:36 AM
                            i think the numbers were 436 / 487 for the header tests. I know there are no cam numbers but around 20 hp/tq loss doesn't seem like a lot.
                            ...and then you have to run it through 20 feet of exhaust pipe and mufflers. Headers may not be worth the trouble on the street. America al just doesn't like headers and that's ok.
                             
                          • yellow rose

                            yellow rose Doctor of Thinkology.

                            Messages:
                            18,813
                            Likes Received:
                            14914
                            Joined:
                            Jun 19, 2015
                            Location:
                            Living on the razors edge
                            Local Time:
                            9:36 AM

                            It is ok. My point was if the cam was ground for exhaust manifolds (which it should have been because that's what the customer wants) then the headers would be at a decided disadvantage. I think the gain/loss would have been greater if the cam were ground for headers. You could (theoretically) use cam timing with a tighter LSA and the intake lobe could open later and faster with the headers and make even more power.
                             
                          • ir3333

                            ir3333 Well-Known Member

                            Messages:
                            4,430
                            Likes Received:
                            1022
                            Joined:
                            Jun 1, 2008
                            Location:
                            ontario,canada
                            Local Time:
                            11:36 AM
                            well...back to the cam selection.Seems like everybody is building a 4" stroke small block.
                            so guys...what are the camshaft specs for your stroker and how does it perform?
                             
                          • aaronk785

                            aaronk785 Well-Known Member

                            Messages:
                            416
                            Likes Received:
                            233
                            Joined:
                            Apr 21, 2013
                            Location:
                            westmoreland ks.
                            Local Time:
                            11:36 AM
                            Crower compu-pro 31243
                             
                          • 12many

                            12many Well-Known Member

                            Messages:
                            798
                            Likes Received:
                            933
                            Joined:
                            Dec 14, 2016
                            Location:
                            South Carolina
                            Local Time:
                            12:36 PM
                            I'm running an Isky 280 Mega circle track in my 410. On a 106 LSA (in at 102°) 280° adv, 232°@ .050", 68° overlap,.323" lobe (.517" w/1.6 rockers) Vacuum I get about 13" hg at idle in park, 11" hg in gear, idle at 900 rpm in park/gear. Runs in the low 12.2 range +/- happy with it, but want more!
                             
                          • 67 gt

                            67 gt A Wog boy who loves his Mopars ! FABO Gold Member

                            Messages:
                            866
                            Likes Received:
                            428
                            Joined:
                            Nov 9, 2011
                            Location:
                            melbourne
                            Local Time:
                            4:36 AM
                          1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                            By continuing to use this site, you are consenting to our use of cookies.