1. aaronk785

    aaronk785 Well-Known Member

    Messages:
    785
    Likes Received:
    592
    Joined:
    Apr 21, 2013
    Location:
    westmoreland ks.
    Local Time:
    11:48 AM
    OK. How many cc's will i lose milling my 915 heads .050.
     
    • Like Like x 2
    • dartfreak75

      dartfreak75 Restore it, Dont part it! FABO Gold Member

      Messages:
      10,797
      Likes Received:
      8391
      Joined:
      Aug 10, 2011
      Location:
      Virginia
      Local Time:
      12:48 PM
      Here is a chart that gives you an estimate. Its pretty close. I milled mine .030 and lost about 7cc according to the chart it will be about 10.4 cc with open chamber heads

      Screenshot_20200526-021318_Gallery.jpg
       
      • Like Like x 2
      • Thanks! Thanks! x 2
      • dartfreak75

        dartfreak75 Restore it, Dont part it! FABO Gold Member

        Messages:
        10,797
        Likes Received:
        8391
        Joined:
        Aug 10, 2011
        Location:
        Virginia
        Local Time:
        12:48 PM
        To use the chart divide the amount to be milled by the number in the chart. Or if you have a particular amount of ccs you want to reduce multiply the amount you want to remove by the number in the chart for example say you have 70cc and you want 65 do 5x.0048=.024 that's how much you need to remove. Or close to it. I'm sure there is a better way out there but that's how is did mine. I wanted to remove 6ccs which was .288 so I just did .030 and it came out to around 7ccs
         
        • Like Like x 1
        • MOPAROFFICIAL

          MOPAROFFICIAL FABO Gold Member FABO Gold Member

          Messages:
          8,955
          Likes Received:
          8270
          Joined:
          Jun 1, 2016
          Location:
          Oceanside ca.
          Local Time:
          9:48 AM
          .040 should be enough to make the average 915 about 63-64cc
           
          • Like Like x 1
          • Agree Agree x 1
          • RustyRatRod

            RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

            Messages:
            77,883
            Likes Received:
            55742
            Joined:
            Jun 7, 2010
            Location:
            Georgia
            Local Time:
            12:48 PM
            And .040 probably will not require the intake to be milled. Although it's possible.
             
            • Like Like x 1
            • 66fs

              66fs FABO Gold Member FABO Gold Member

              Messages:
              6,002
              Likes Received:
              2551
              Joined:
              Sep 9, 2009
              Location:
              Greenwood, South Carolina
              Local Time:
              12:48 PM
              At .040 I'd mill the intake side .038 to keep everything in the right relationship.
               
              • Like Like x 1
              • Thanks! Thanks! x 1
              • Agree Agree x 1
              • aaronk785

                aaronk785 Well-Known Member

                Messages:
                785
                Likes Received:
                592
                Joined:
                Apr 21, 2013
                Location:
                westmoreland ks.
                Local Time:
                11:48 AM
                Thanks everyone. I'm trying to come in at 60 cc so I will go .050 and that should get me close. Yes I will shave the intake side .0475. Heads do have SS valves that are flat on the bottom so that should help a little. Thanks again.
                 
                • Like Like x 1
                • MOPAROFFICIAL

                  MOPAROFFICIAL FABO Gold Member FABO Gold Member

                  Messages:
                  8,955
                  Likes Received:
                  8270
                  Joined:
                  Jun 1, 2016
                  Location:
                  Oceanside ca.
                  Local Time:
                  9:48 AM
                  Mine are 59.8
                   
                  • Like Like x 1
                  • Thanks! Thanks! x 1
                  • 7e5hangten360

                    7e5hangten360 semi-pro

                    Messages:
                    144
                    Likes Received:
                    17
                    Joined:
                    Jun 24, 2011
                    Location:
                    montreal, qc, canada
                    Local Time:
                    12:48 PM
                    you should remove 10.3ccs with a .050 in. cut if you dont touch the chambers, assuming a 4 in. bore in the chamber.
                     
                    • Like Like x 1
                    • pishta

                      pishta I know I'm right....

                      Messages:
                      21,014
                      Likes Received:
                      10297
                      Joined:
                      Oct 13, 2004
                      Location:
                      Tustin, CA
                      Local Time:
                      9:48 AM
                      What the quote on that mill job? I got a set that needs a clean up and may as well get it to where I want it, as well as the intake.
                       
                    • oldkimmer

                      oldkimmer FABO Gold Member FABO Gold Member

                      Messages:
                      20,389
                      Likes Received:
                      7257
                      Joined:
                      Nov 11, 2006
                      Location:
                      Kindersley, Saskatchewan,
                      Local Time:
                      11:48 AM
                      It cost more the more u have them milled. Simply because they have to make more passes to take more off. The intake side is another charge. Same goes with it. Kim
                       
                      • Agree Agree x 1
                      • MOPAROFFICIAL

                        MOPAROFFICIAL FABO Gold Member FABO Gold Member

                        Messages:
                        8,955
                        Likes Received:
                        8270
                        Joined:
                        Jun 1, 2016
                        Location:
                        Oceanside ca.
                        Local Time:
                        9:48 AM
                        Some shops want 200.00 to mill an intake.
                         
                      • MOPAROFFICIAL

                        MOPAROFFICIAL FABO Gold Member FABO Gold Member

                        Messages:
                        8,955
                        Likes Received:
                        8270
                        Joined:
                        Jun 1, 2016
                        Location:
                        Oceanside ca.
                        Local Time:
                        9:48 AM
                        Some shops want 200.00 to mill an intake.
                         
                      • oldkimmer

                        oldkimmer FABO Gold Member FABO Gold Member

                        Messages:
                        20,389
                        Likes Received:
                        7257
                        Joined:
                        Nov 11, 2006
                        Location:
                        Kindersley, Saskatchewan,
                        Local Time:
                        11:48 AM
                        Last edited: Jul 17, 2021
                      • oldkimmer

                        oldkimmer FABO Gold Member FABO Gold Member

                        Messages:
                        20,389
                        Likes Received:
                        7257
                        Joined:
                        Nov 11, 2006
                        Location:
                        Kindersley, Saskatchewan,
                        Local Time:
                        11:48 AM
                        My porter charged me $175.00 Canadian to mill mine .005. Kim
                         
                      • MOPAROFFICIAL

                        MOPAROFFICIAL FABO Gold Member FABO Gold Member

                        Messages:
                        8,955
                        Likes Received:
                        8270
                        Joined:
                        Jun 1, 2016
                        Location:
                        Oceanside ca.
                        Local Time:
                        9:48 AM
                        The more passes..the more money.

                        80 bucks for a your basic .003 off a pair of heads. One pass each.
                         
                      • 66fs

                        66fs FABO Gold Member FABO Gold Member

                        Messages:
                        6,002
                        Likes Received:
                        2551
                        Joined:
                        Sep 9, 2009
                        Location:
                        Greenwood, South Carolina
                        Local Time:
                        12:48 PM
                        My machine shop can cut up to .020 a pass, so figure it out from there. Then I cut the intake side to keep everything in the right relationship. Evidently there is a wide spread on milling costs per machine shop. I never tried to cheap out on performance builds. You have to do what it takes at your level.
                         
                      • 512Stroker

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

                        Messages:
                        3,035
                        Likes Received:
                        2386
                        Joined:
                        May 30, 2016
                        Location:
                        Freedom, MO
                        Local Time:
                        11:48 AM
                        If this is a fresh build, why not leave the heads and intake alone and just use other pistons.
                        Just spit balling
                         
                      • 66fs

                        66fs FABO Gold Member FABO Gold Member

                        Messages:
                        6,002
                        Likes Received:
                        2551
                        Joined:
                        Sep 9, 2009
                        Location:
                        Greenwood, South Carolina
                        Local Time:
                        12:48 PM
                        Heads always "warp" a bit so while you are milling them flat again, I just would go the whole .020. Then mill the intake side .019 to keep the head surfaces in the right relationship to each other. You only have to do this once as they don't "move" much after all those years and thermal cycles. I never mill an intake manifold, unless it is out of spec. I still have High Performance blocks from 273's, a 318 Magnum, and 340's that will clean up with a hone, so I will reuse the pistons in those blocks. Those engines are not compression challenged, so I do not feel the need to add the extra expense of boring and pistons. I assume the OP is keeping his short block as is or is just freshening up the motor.
                         
                      • 70Hardtop

                        70Hardtop Well-Known Member

                        Messages:
                        333
                        Likes Received:
                        68
                        Joined:
                        Oct 14, 2009
                        Location:
                        Australia
                        Local Time:
                        12:48 AM
                        I don't see a problem, that's not far out.. Sure they are not in the exact centre of the hole but they look like they have been easily started and port matching will need to be done. But if they are all like that the inlet will still bolt down properly. If only 3/4 of the thread was visible through the hole, now that would be a problem and the intake would need to be machined.
                         
                      • oldkimmer

                        oldkimmer FABO Gold Member FABO Gold Member

                        Messages:
                        20,389
                        Likes Received:
                        7257
                        Joined:
                        Nov 11, 2006
                        Location:
                        Kindersley, Saskatchewan,
                        Local Time:
                        11:48 AM
                        The bolt angle is way off also. It’s a .040 over 340. TRW pistons. Speedmaster heads. Howard’s cam. Balance rotating assambly. Kim

                        39DF8F94-9FCA-400E-BEF8-2E135A751290.jpeg

                        12A35DF7-4215-4B92-A59C-55C4A1EB767F.jpeg

                        9A26ED34-62EC-4B39-9C1E-CAAAB0C2F85F.jpeg

                        3DD2761E-D316-4B3E-AA39-B7BB7641F2F5.jpeg

                        EA75BAFB-0F03-49E2-B9ED-DDCF0AB55070.jpeg

                        View attachment 1715774110

                        956FB77B-D78B-4B19-A073-791ED51AF886.jpeg

                        E79B0A7D-12B2-4E35-80D5-73E7B7142BEE.jpeg

                        A993011A-F5B7-456E-BFE0-428E9C1D356E.jpeg

                        2D7D91E5-8F98-4A2E-8ACC-13E37B06F474.jpeg
                         
                      • oldkimmer

                        oldkimmer FABO Gold Member FABO Gold Member

                        Messages:
                        20,389
                        Likes Received:
                        7257
                        Joined:
                        Nov 11, 2006
                        Location:
                        Kindersley, Saskatchewan,
                        Local Time:
                        11:48 AM
                        It took .030 to make the intake fit. The angle was off also. Kim
                         
                      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.