Adding studs for main caps

Small Block Mopar Engine

  1. jimmer

    jimmer Well-Known Member

    Messages:
    1,779
    Likes Received:
    1379
    Joined:
    Jul 20, 2012
    Location:
    stanwood
    Local Time:
    6:48 AM
    I'm curious , when adding studs on main caps do I need to have align bored ?
    Or can I just add studs ?
     
    Last edited: Nov 27, 2020
  2. 67 gt

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

    Messages:
    1,143
    Likes Received:
    832
    Joined:
    Nov 9, 2011
    Location:
    Down under
    Local Time:
    1:48 AM
    An alignment hone at least.
     
    • Thanks! Thanks! x 1
    • dano

      dano Evil Handy Man

      Messages:
      3,527
      Likes Received:
      1411
      Joined:
      Aug 22, 2005
      Location:
      Gresham, Oregon
      Local Time:
      6:48 AM
      I've always been told to lone hone with studs installed and torque the nuts to what the shop torques the too when honed.
       
      • Thanks! Thanks! x 1
      • famous bob

        famous bob mopar misfit

        Messages:
        18,426
        Likes Received:
        7792
        Joined:
        Aug 14, 2011
        Location:
        okla
        Local Time:
        8:48 AM
        Everybody recommends a hone at least , I had mine line honed .
        That being said , if doing another , I`d assemble the caps w/ the new studs in it , and check the mating surfaces , if their perfect , I wouldn`t worry about it .
        If u can feel any ledge at all on even one cap , , go the expensive route ------------jmo.
         
        • Agree Agree x 2
        • rklein383

          rklein383 Well-Known Member

          Messages:
          1,601
          Likes Received:
          520
          Joined:
          Dec 2, 2005
          Local Time:
          8:48 AM
          I put studs on my mains in my 440, torqued it down and verified the crank spun freely. It did, good to go and never looked back. I just don't see how putting studs would change the alignment of the caps, they are stout and are a tight fit into the block. Just my opinion, however, I am not a pro.
           
          • Agree Agree x 2
          • Like Like x 1
          • 67Dart273

            67Dart273 FABO Gold Member FABO Gold Member

            Messages:
            46,675
            Likes Received:
            14578
            Joined:
            Oct 14, 2010
            Location:
            Idaho
            Local Time:
            6:48 AM
            I was just going to ask that question
             
            • Thanks! Thanks! x 1
            • Agree Agree x 1
            • cawcislo

              cawcislo Well-Known Member

              Messages:
              338
              Likes Received:
              217
              Joined:
              Aug 7, 2018
              Location:
              Ontario, Canada
              Local Time:
              9:48 AM
              I put main studs in my recent stroker build and had it align honed. If you’re going with the expense of main studs then you’re probably building something where you’ve spent cash for good parts. Why take the chance of something going wrong and wasting a bunch of money and good parts to save a few bucks on an align hone.
               
              • Agree Agree x 2
              • Like Like x 1
              • Thanks! Thanks! x 1
              • MOPAROFFICIAL

                MOPAROFFICIAL FABO Gold Member FABO Gold Member

                Messages:
                7,343
                Likes Received:
                6429
                Joined:
                Jun 1, 2016
                Location:
                Beach
                Local Time:
                6:48 AM
                Yep.
                Ive done it w/o checking, just sent it for a line hone that is.. assuming it needed honed...when it may have not.

                Dial bore gauge is handy to check whats needed if anything. And yes torque to spec or what the machinist torqued to when honing if going that route.
                 
                • Agree Agree x 1
                • yellow rose

                  yellow rose Overnight Sensation FABO Gold Member

                  Messages:
                  27,277
                  Likes Received:
                  23510
                  Joined:
                  Jun 19, 2015
                  Location:
                  Central Washington
                  Local Time:
                  6:48 AM
                  They CAN distort the bore differently than a bolt will. You can’t feel it with your finger but you can easily see it with a bore gauge.

                  The other issue is the stud is way less forgiving as far as being off axis (perpendicular in all planes to the block) than a bolt is. The bolt holes are often drilled and tapped crooked and with a bolt it’s not a big deal.

                  Most main studs are not undercut like the bolts are, so if the holes in the block aren’t perfect (who says the hole in the cap is correct??) you can end up with the stud binding in the hole when you put the cap on.

                  Some guys just get out the BFH and beat the cap into the registers, but that will certainly distort the bearing bore.

                  If you are going to install main studs you should at least make sure the stud doesn’t bind in the cap and measure the hole with a bore gauge to make sure it’s still round.
                   
                  • Agree Agree x 3
                  • Thanks! Thanks! x 2
                  • Like Like x 1
                  • famous bob

                    famous bob mopar misfit

                    Messages:
                    18,426
                    Likes Received:
                    7792
                    Joined:
                    Aug 14, 2011
                    Location:
                    okla
                    Local Time:
                    8:48 AM
                    Studs are usually bigger in diameter than stock bolts, could mis align the cap , happens all the time .

                    YR BEAQT ME TOO IT ---
                     
                  • moper

                    moper FABO Gold Member FABO Gold Member

                    Messages:
                    15,852
                    Likes Received:
                    1967
                    Joined:
                    Dec 27, 2004
                    Location:
                    eastern CT
                    Local Time:
                    2:48 PM
                    YR nailed it. The fact you can’t feel it just means you’re not actually checking what you need to, with a method that can actually do it.
                     
                  • rklein383

                    rklein383 Well-Known Member

                    Messages:
                    1,601
                    Likes Received:
                    520
                    Joined:
                    Dec 2, 2005
                    Local Time:
                    8:48 AM
                    Call me crazy, but I don't see how studs could misalign a main cap. I guess they could distort the block as mentioned above...but other than that, I don't see it.
                     
                  • jimmer

                    jimmer Well-Known Member

                    Messages:
                    1,779
                    Likes Received:
                    1379
                    Joined:
                    Jul 20, 2012
                    Location:
                    stanwood
                    Local Time:
                    6:48 AM
                    So how about 2 bolt main caps .
                    Does anyone know who makes them these days ?
                     
                    Last edited: Nov 27, 2020
                  • rklein383

                    rklein383 Well-Known Member

                    Messages:
                    1,601
                    Likes Received:
                    520
                    Joined:
                    Dec 2, 2005
                    Local Time:
                    8:48 AM
                  • jimmer

                    jimmer Well-Known Member

                    Messages:
                    1,779
                    Likes Received:
                    1379
                    Joined:
                    Jul 20, 2012
                    Location:
                    stanwood
                    Local Time:
                    6:48 AM
                    Isn't 440 source for big blocks ?
                     
                  • yellow rose

                    yellow rose Overnight Sensation FABO Gold Member

                    Messages:
                    27,277
                    Likes Received:
                    23510
                    Joined:
                    Jun 19, 2015
                    Location:
                    Central Washington
                    Local Time:
                    6:48 AM

                    Cast iron and any other metal isn’t nearly as rigid as one might think. It’s relatively easy to get a hole out of round with very little effort.
                     
                  • 33IMP

                    33IMP Well-Known Member

                    Messages:
                    602
                    Likes Received:
                    626
                    Joined:
                    Jul 3, 2020
                    Location:
                    Taxifornia, soon 2b arizona
                    Local Time:
                    6:48 AM
                    BCR makes aluminum maincaps, both original style, and a special design to use with their girdle.
                    If you want to make the most power your b-rb can with a stock block, i would try their cap/girdle/studs combo. There WILL be a machinist bill!
                    All the expense to make a stock block bottom end strong wouldnt be necessary if aftermarket iron blocks were available again.
                     
                  • rklein383

                    rklein383 Well-Known Member

                    Messages:
                    1,601
                    Likes Received:
                    520
                    Joined:
                    Dec 2, 2005
                    Local Time:
                    8:48 AM
                    Yes, for some reason I thought you had a big block.
                     
                  • jimmer

                    jimmer Well-Known Member

                    Messages:
                    1,779
                    Likes Received:
                    1379
                    Joined:
                    Jul 20, 2012
                    Location:
                    stanwood
                    Local Time:
                    6:48 AM
                    ^^^^
                    It's all good
                     
                  • 33IMP

                    33IMP Well-Known Member

                    Messages:
                    602
                    Likes Received:
                    626
                    Joined:
                    Jul 3, 2020
                    Location:
                    Taxifornia, soon 2b arizona
                    Local Time:
                    6:48 AM
                    Yep, sorry. I didnt notice what thread i was in. I dont know if BCR makes caps for small blocks.
                     
                  • pishta

                    pishta I know I'm right....

                    Messages:
                    19,166
                    Likes Received:
                    8579
                    Joined:
                    Oct 13, 2004
                    Location:
                    Tustin, CA
                    Local Time:
                    6:48 AM
                    IIRC studs are fine thread at the nut end and main cap bolts are not so the torque on a fine pitch is going to change the clamping force and possibly distort the shape. Id torque the new ones down and see if your crank has any drag on it. I know its 'SOP' to align hone (as well as resize your rods for ARP type bolts) but probably not essential.
                     
                    • Thanks! Thanks! x 1
                    • jimmer

                      jimmer Well-Known Member

                      Messages:
                      1,779
                      Likes Received:
                      1379
                      Joined:
                      Jul 20, 2012
                      Location:
                      stanwood
                      Local Time:
                      6:48 AM
                      So here is the deal after many years of parts sitting on the shelf, the time has come to get on it.
                      Not sure what it will make hp and torque ?
                      It is a 040 over 360
                      Eagle forged crank
                      Eagle I beam rods
                      Srp forged pistons can't remember compression ?
                      I think around 11.1
                      Lunati solid lifter cam 290/308 550/571 106c
                      Heads are pro comp cnc with hand work
                      2.05 1.625 valves
                      Hughes 1.6 roller rockers.
                      Internally balanced.
                      Ported air gap intake.
                      Demon 850 if I remember right ?
                      With that said , now I'm wondering about main studs, girdle ect.
                      Thanks for all the replies.
                       
                    • pishta

                      pishta I know I'm right....

                      Messages:
                      19,166
                      Likes Received:
                      8579
                      Joined:
                      Oct 13, 2004
                      Location:
                      Tustin, CA
                      Local Time:
                      6:48 AM
                      465HP-480tq, hope I'm low. Let us know. I think the dual plane air gap intake will hurt your max HP.
                       
                    • jimmer

                      jimmer Well-Known Member

                      Messages:
                      1,779
                      Likes Received:
                      1379
                      Joined:
                      Jul 20, 2012
                      Location:
                      stanwood
                      Local Time:
                      6:48 AM
                      I hope you are real low.
                      The heads flow pretty well.
                      The intake has been ported.
                      We shall find out !
                       
                      • Like Like x 1
                      • Rmoore

                        Rmoore Well-Known Member

                        Messages:
                        503
                        Likes Received:
                        344
                        Joined:
                        Nov 14, 2018
                        Location:
                        Gun Barrel City, Texas
                        Local Time:
                        8:48 AM
                        Put your crankshaft in ! Torque the nuts to spec’s ! Spin the crankshaft over ! If the crankshaft spins freely !! You are good to go ! I’m the guy who doesn’t have money to fix things that are not broke ! A lot you guys, money is no object ! If I was that way I probably would have it all done also no question ask ! But I’m not ! I have built several motors all big blocks that I have put main studs in! Everyone of them the crankshaft spun freely ! And everyone of them are still running today ! To each his own ! You feel like you need or want to hone or bore do it ! It’s durn sure not going to hurt a thing ! And I would in a heartbeat if I put my crankshaft in and the crankshaft had a tight spot when I was turning it ! Just my opinion
                         
                        • Agree Agree x 4
                        • Thanks! Thanks! x 1
                        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.