318 head porting for the average joe

Small Block Mopar Engine

  1. Cudafever

    Cudafever Well-Known Member

    Messages:
    4,117
    Likes Received:
    1432
    Joined:
    Sep 27, 2009
    Local Time:
    10:48 AM
    Easy? bowl blend yes, SSR well, if you say so. Personally, i would never recommend it to a beginner.
    To answer you question. because the man that designed the head was Performance minded.............the man the made the final design on the casting was Cost minded.

    I can just here the argument. "Performance: YOU CHANGED MY DESIGN AND DESTROYED THE HEAD! Cost: At .420 lift it don't flow any different and it cost less to make. Performance: YOU LOST 20 CFM!!!! Cost: like i said, didn't change a thing. And i will be the one that gets a bonus for saving the company money.
    Corporate: nothing wrong with the engine SHIP!
     
    • Agree Agree x 1
    • pishta

      pishta I know I'm right....

      Messages:
      17,316
      Likes Received:
      6926
      Joined:
      Oct 13, 2004
      Location:
      Tustin, CA
      Local Time:
      9:48 AM
      Yeah, I guess your right, although making W2 heads must have been a colossal bust when they could only sell them to the race teams and not put them on a production truck, and the T/A head with its unique rockers and pushrod hole that still had the same port? They could get a new rocker arm designed and produced ($$$) as well as change a production step ($) but couldnt clean up a casting mold? Corporate Chrysler when a nickle was worth a million. ....There was an in-house Ford 4cyl head that was a Cosworth killer and the production run ended up having an intake port with a 90 bend in it, as opposed to the almost 45 straight shot it was designed with for hood clearance that wasnt on the initial plans. The designer quit!
       
      • Like Like x 2
      • Thanks! Thanks! x 1
      • Cudafever

        Cudafever Well-Known Member

        Messages:
        4,117
        Likes Received:
        1432
        Joined:
        Sep 27, 2009
        Local Time:
        10:48 AM
        Now that sound just about right.
        They would have been so GREAT to have production W2 eng. but them W2 came out during the gas crunch. Everyone was looking for M.P.G. not HP. Would have been a hard sell on a 79 Cordoba......... I mean they were already tooled up. could have been easy to put into production.
         
        • Like Like x 2
        • STRorange

          STRorange Well-Known Member

          Messages:
          55
          Likes Received:
          58
          Joined:
          Mar 31, 2018
          Location:
          Isle of Sheeps, UK
          Local Time:
          5:48 PM
          After seeing the Engine Masters S/B stroker dyno runs with Edelbrocks, I think the iron heads are all but finished on strokers, doh...
          So when I saw a set of Brodix B1-BA come up for sale in the UK I snapped them up!
          Gonna fit some 1.60 titanium ex race valves in them and bolt on a Blower!!!
          If Folks can run mid NINES in the UK with Eddy headed 408-360 motors then I feel the EIGHT's coming into view lol...
          441cube S/B, (+100 360 with a Hughes 4.100 crank), maybe even sevens???:rofl:
           
          Last edited: Jun 3, 2018
        • stixx

          stixx Well-Known Member

          Messages:
          785
          Likes Received:
          553
          Joined:
          May 30, 2006
          Location:
          Southern Germany
          Local Time:
          5:48 PM
          Until you split the block... :wtf:
           
          • Like Like x 1
          • Wyrmrider

            Wyrmrider FABO Gold Member FABO Gold Member

            Messages:
            3,383
            Likes Received:
            1613
            Joined:
            Sep 5, 2016
            Location:
            los angeles
            Local Time:
            9:48 AM
            TI on the intake
            TI on the exhaust drags only or do others have success on longevity
            I tended to use Inconel on the exhausts on turbo IDK about Mopar LA and Blower
            should not be too bad unless U have too much overlap
            keep the valves on the seats to keep them cool if you want longevity or HD use
             
            • Agree Agree x 1
            • charles mill

              charles mill Wildman68 FABO Gold Member

              Messages:
              264
              Likes Received:
              19
              Joined:
              Jun 20, 2014
              Location:
              oklahoma
              Local Time:
              11:48 AM
              I hate to be simple. ur doing port ? udoing polish? you ask tell all of us. work on any head is not as by hand simple by hand. a good way is to have valve job done. company a good one. take heads any and u get some measuring stuf as in cooking. take this for chamber head.. valves closed heads level take and put or inject fluid into open chamber on head block side turned up and level measure. that's ccd.. do the same 4 intake port and exhaust port keep turning with valves in head. port and redo same to ck ur self.. . as good as any volume is what works. now smooth and flow cones second.
               
            • charles mill

              charles mill Wildman68 FABO Gold Member

              Messages:
              264
              Likes Received:
              19
              Joined:
              Jun 20, 2014
              Location:
              oklahoma
              Local Time:
              11:48 AM
              comes second not cones thanks.
               
            • charles mill

              charles mill Wildman68 FABO Gold Member

              Messages:
              264
              Likes Received:
              19
              Joined:
              Jun 20, 2014
              Location:
              oklahoma
              Local Time:
              11:48 AM
              HORSE POWER $ THE MONEY. thanks
               
            • charles mill

              charles mill Wildman68 FABO Gold Member

              Messages:
              264
              Likes Received:
              19
              Joined:
              Jun 20, 2014
              Location:
              oklahoma
              Local Time:
              11:48 AM
              thanks I did this yrs ago. hay I kicked ass and won. point simple new and any head this works. WORK YES. simple kinda.
               
            • Wyrmrider

              Wyrmrider FABO Gold Member FABO Gold Member

              Messages:
              3,383
              Likes Received:
              1613
              Joined:
              Sep 5, 2016
              Location:
              los angeles
              Local Time:
              9:48 AM
              • Thanks! Thanks! x 1
              • MOPAROFFICIAL

                MOPAROFFICIAL FABO Gold Member FABO Gold Member

                Messages:
                5,714
                Likes Received:
                4671
                Joined:
                Jun 1, 2016
                Location:
                Beach
                Local Time:
                9:48 AM
                Great thread, glad it helped some people.
                Found a set of 920 closed chamber heads.They had hard seats, so why not..
                Closed chambers. Ugly lookin edges and shrouding.

                Flowed a intake on 4" bore @28"
                .100-55
                .200-109
                .300-161.2
                .400-177.9
                .500174..turbulence
                .550-177.2
                .600-181





                20200101_170551.jpg
                 
                Last edited: Jan 11, 2020
                • Thanks! Thanks! x 2
                • Like Like x 1
                • MOPAROFFICIAL

                  MOPAROFFICIAL FABO Gold Member FABO Gold Member

                  Messages:
                  5,714
                  Likes Received:
                  4671
                  Joined:
                  Jun 1, 2016
                  Location:
                  Beach
                  Local Time:
                  9:48 AM
                  Cleaned up chamber a little, still right at 3.90" bore size. From the factory these heads are already bigger than the 273 bore.
                  Some people call the recess next to plug a depth point for the machine process...others say it's for the flame colonel. Food for thought..

                  Flowed after the chamber shape valve unshrouding, nothing else.note this head has a valve job , very basic, thin seat margin though lacking somewhat to the factory valve job top cut/lower.
                  Int cfm @28" 4" bore 1.78 valve
                  .100-59
                  .200-113
                  .300-165
                  .400-182
                  .500-178
                  .550-181
                  .600-181.5
                  .650-184




                  20200107_151610.jpg
                   
                  Last edited: Jan 11, 2020
                  • Like Like x 2
                  • Thanks! Thanks! x 1
                  • MOPAROFFICIAL

                    MOPAROFFICIAL FABO Gold Member FABO Gold Member

                    Messages:
                    5,714
                    Likes Received:
                    4671
                    Joined:
                    Jun 1, 2016
                    Location:
                    Beach
                    Local Time:
                    9:48 AM
                    Worked and shortened the guide, straight/common wall, bowl, opened pinch and removed .030 from the roof half way in and right over the turn. What you call very ported....yet I did not gasket match the port window at all. Hand cleanup with 60 grit right in the bowl under the seat. Hope it helps somebody who wants to modify these heads low buck.
                    Intake Cfm @28 4" bore 1.78 valve
                    .100-62.9
                    .200-120
                    .300-172
                    .400-195
                    .500-201
                    .600-207
                    ..beyond turbulence 193cfm
                    These rival stock 360 flow #s...but who cares.
                    20200111_135755.jpg

                    20200111_135002.jpg

                    20200111_134937.jpg

                    20200111_134727.jpg
                     
                    Last edited: Jan 11, 2020
                    • Like Like x 3
                    • Thanks! Thanks! x 3
                    • Wyrmrider

                      Wyrmrider FABO Gold Member FABO Gold Member

                      Messages:
                      3,383
                      Likes Received:
                      1613
                      Joined:
                      Sep 5, 2016
                      Location:
                      los angeles
                      Local Time:
                      9:48 AM
                      Thanks for the update
                      I'm going to try those heads with a slightly larger intake and 30 degree seat and see if I can get rid of that step just outside the current valve
                      I''ll cut the bottom steps, like 3 on the serdi and blend the bottom
                      whatta you think
                       
                      • Like Like x 3
                      • MOPAROFFICIAL

                        MOPAROFFICIAL FABO Gold Member FABO Gold Member

                        Messages:
                        5,714
                        Likes Received:
                        4671
                        Joined:
                        Jun 1, 2016
                        Location:
                        Beach
                        Local Time:
                        9:48 AM
                        Easier than hand shaping the entire thing.
                        Cut the seats, stones are great but the cutter is so consistent and clean. The bowl size needs maxed.
                         
                      • Cudafever

                        Cudafever Well-Known Member

                        Messages:
                        4,117
                        Likes Received:
                        1432
                        Joined:
                        Sep 27, 2009
                        Local Time:
                        10:48 AM
                        Are you really going to cut the seat and valve to 30 degrees or did you mean the top cut was going to be 30 degrees on the seat.
                         
                        • Like Like x 1
                        • Wyrmrider

                          Wyrmrider FABO Gold Member FABO Gold Member

                          Messages:
                          3,383
                          Likes Received:
                          1613
                          Joined:
                          Sep 5, 2016
                          Location:
                          los angeles
                          Local Time:
                          9:48 AM
                          cut the valve and seat
                          works to give more "curtain area' for low lift grinds under .500 roughly
                          of course really high lift cams can go more than 45 degrees
                          It's also a way to get a new higher seat just sitting the valve on top of the old "top cut"
                          which it appears the head in question does not have much of
                          for the valve you have to start off with a larger one and cut it down or the edge gets too thin
                          I usually measure the curtain at the inside of the seat
                          others use the outside
                           
                          • Like Like x 2
                          • Thanks! Thanks! x 1
                          • 66fs

                            66fs FABO Gold Member FABO Gold Member

                            Messages:
                            4,682
                            Likes Received:
                            1406
                            Joined:
                            Sep 9, 2009
                            Location:
                            Greenwood, South Carolina
                            Local Time:
                            12:48 PM
                            Interesting to note these heads are flowing 182 at .400 and no more after that. No wonder cams for 273's are in the low .400's. Just a waste of motion to go any higher with unported heads. Thanks for all your work!
                             
                            • Like Like x 1
                            • Thanks! Thanks! x 1
                            • Agree Agree x 1
                            • MOPAROFFICIAL

                              MOPAROFFICIAL FABO Gold Member FABO Gold Member

                              Messages:
                              5,714
                              Likes Received:
                              4671
                              Joined:
                              Jun 1, 2016
                              Location:
                              Beach
                              Local Time:
                              9:48 AM
                              No prob, neat stuff.
                              In stock form, definitely.
                              Many things considered.. like the intake manifold bolted on makes the hiccup go away as well as knocking down the numbers a touch...then you look at the factory cams, 340, 383 roadrunner cam, tnt .. all right at the fall off of the heads in question. Chrysler presumably designed that in with both series 273/318 and 340/360 heads. They all hiccup around .490 lift and then reemerge, some, by .550 lift.
                              The intake port above is probably around 132cc , tiny, but will make the little motors breathe fire without skipping a beat.
                               
                              Last edited: Jan 16, 2020
                              • Like Like x 3
                              • Thanks! Thanks! x 2
                              • Wyrmrider

                                Wyrmrider FABO Gold Member FABO Gold Member

                                Messages:
                                3,383
                                Likes Received:
                                1613
                                Joined:
                                Sep 5, 2016
                                Location:
                                los angeles
                                Local Time:
                                9:48 AM
                                • Thanks! Thanks! x 1
                                • Hysteric

                                  Hysteric Well-Known Member

                                  Messages:
                                  171
                                  Likes Received:
                                  56
                                  Joined:
                                  Dec 31, 2005
                                  Local Time:
                                  11:48 AM
                                  From memory my 302's are about 136-140cc but with a 1.90 11/32 valve the flow is up to 242 cfm @ .500
                                   
                                • MOPAROFFICIAL

                                  MOPAROFFICIAL FABO Gold Member FABO Gold Member

                                  Messages:
                                  5,714
                                  Likes Received:
                                  4671
                                  Joined:
                                  Jun 1, 2016
                                  Location:
                                  Beach
                                  Local Time:
                                  9:48 AM
                                  What bore size are you using them on?
                                  Hughes claims 270 from a 302 casting.
                                   
                                • Hysteric

                                  Hysteric Well-Known Member

                                  Messages:
                                  171
                                  Likes Received:
                                  56
                                  Joined:
                                  Dec 31, 2005
                                  Local Time:
                                  11:48 AM
                                  I'm note sure what bore size they we flowed on but most likely 4.00. They are going back onto a 70 over 360
                                   
                                  • Like Like x 1
                                  • MOPAROFFICIAL

                                    MOPAROFFICIAL FABO Gold Member FABO Gold Member

                                    Messages:
                                    5,714
                                    Likes Received:
                                    4671
                                    Joined:
                                    Jun 1, 2016
                                    Location:
                                    Beach
                                    Local Time:
                                    9:48 AM
                                    Low rpm stump puller eh? Cause there is not other FKN reason you would run those right mate?
                                     
                                  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.