Steel bolts into aluminum?

Engine, Trans & Driveline

  1. 493 Mike

    493 Mike FBBO Gold Member FBBO Gold Member

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    Hi fellas,
    What product/treatment is correct or best to use when fastening parts to aluminum engine blocks?
    Mike
     
  2. miller

    miller Well-Known Member

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    Aluminum block needs to be fitted with STUDS.
    Only was to consider using a bolt in an aluminum block, is if the bolt hole has a helicoil in it, that depending on it's location.
     
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    • MOPOWER871

      MOPOWER871 FBBO Gold Member FBBO Gold Member

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      Mike, what block? are we talking head bolts/studs? or oil pan rail ,water pump.... if your going into a water jacket I use loctite 565,thread sealant/lubracant.
      for heads on an aluminum bock use a head stud (ARP). Bolts only if heli coiled, aluminum blocks have deeper threads and require a longer stud . nickle based anti seize is best if holes are not wet. spark plugs in aluminum heads a little dab will do ya.I like to use studs when ever applicable.
      Mike heres some good info on anti seize for reading pleasure. good luck .www.antiseize.com/PDFs/how-to-choose-an-antiseize.pdf
       
      Last edited: Nov 6, 2016
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      • 493 Mike

        493 Mike FBBO Gold Member FBBO Gold Member

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        I pulled the oil pump off my new Indy block (secured with Allen head bolts) for modification of the cover and wondered what technique was best for reassembly. I believe the engine builder used maybe a thread locker, due to the residue in the threads ( have not contacted Muscle Motors yet). I have always used anti seize on spark plugs in aluminum due to the heat they endure. Other areas do not get so hot, so I have seen some recommend 30 weight motor oil with FSM torque specs and others a reduced torque amount with various lubricants/sealants. Thanks.
        Mike
         
      • lewtot184

        lewtot184 Well-Known Member

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        if possible this is best.
         
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        • miller

          miller Well-Known Member

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          Guess I'll dummy up on the heads, since I've never fooled with V8 aluminum heads. Don't the spark plug holes have a steel threaded insert in them? Or, are those threads actually aluminum?
          Same deal on the intake bolt locations in the heads...studs sure won't work.
          Lol, sorry guys, still got those round motors still bouncing around.
           
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          • dvw

            dvw Well-Known Member

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            Heads are seldom fitted with thread inserts. I have them installed for my bed plate for the rockers. But that was due to offsetting it on the head.
            Doug
             
          • PRND21

            PRND21 FBBO Gold Member FBBO Gold Member

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            X2 on using studs especially if it has to be taken apart occasionally. If not I use stainless steel bolts with silver anti- seize compound. Remember torque ratings are different for aluminum components.
             
          • Cranky

            Cranky Banned Staff Member FBBO Gold Member

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            Didn't notice any inserts in the spark plugs holes on my Eddy heads but I like to use studs in as many places as I can. Round motors.....uh, radials? And what's the population of Tom Bean?
             
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            • bm02tj

              bm02tj Well-Known Member

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              Look up galvanic action
               
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              • coloradodave

                coloradodave FBBO Gold Member FBBO Gold Member

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                Thanks for taking the time to post that info...
                 
              • 493 Mike

                493 Mike FBBO Gold Member FBBO Gold Member

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                hey guys,
                Thanks for the responses. I used 30 w motor oil on the pump to block bolts and torqued to factory 35# spec.
                 
              • miller

                miller Well-Known Member

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                Guess it's just me...cannot picture putting sparky plugs into aluminum threads...must be my warped way of thinkin'! But, admit I've never took a good look at any V8 aluminum heads.

                Yeah on the round motors (and all that lovely horsepower!!!), OHCed both Wrights and (ugh) Pratts. Mainly R-1820s, 1830s, 2600s, 2800s. Just under 20 years. Some called me 'Prattman', since I hated working on 'em.

                Tom Bean? Not for sure...maybe 2-3 thou., just a wild guess.

                493 Mike...good luck on that motor!!
                 
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                • dvw

                  dvw Well-Known Member

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                  What is a "sparky plug"? Really? Look at a production head, they are all aluminum. None have thread inserts.
                  Doug
                   
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                  • miller

                    miller Well-Known Member

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                    Yeah, really. Got my own ways.
                    Good to hear on the aluminum heads...
                     
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