I'm using Hughes roller lifters and

Small Block Mopar Engine

  1. Nat

    Nat Well-Known Member

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    roller rockers on my 360 . they say to use 10w 30 oil only I've always used royal purple XPR10-40 will I Damage the lifters using the 10-40 or will it be safe to use once the engine is broken in ?
    Anybody using these lifters with oil heavier than 10w-30 ? okay I'l play find a photo this good enough?

    DSC_0061.jpg
     
    Last edited: Oct 18, 2019
  2. Nat

    Nat Well-Known Member

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    Thanks , so back to the royal purple XPR 10w 40
     
  3. Nat

    Nat Well-Known Member

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    Untitle984566d.jpg
    sorry about the bad attachment it's all i could find
     
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    • brian6pac

      brian6pac Well-Known Member

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      I don't understand the 10W30 thing, to thin for me.
       
    • Nat

      Nat Well-Known Member

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      it is what Hughes says to use with their roller lifters , what do I know ? that's why I asked here , figured someone here would know if it was okay to use a thicker oil
       
    • brian6pac

      brian6pac Well-Known Member

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    • mullinax95

      mullinax95 Well-Known Member

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      Brian at IMM Engines told me to run 10w30 in the engine he built for me. So that's what I run no questions asked. lol
       
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      • BigBlockMopar

        BigBlockMopar BigBlockMember

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        There's usually no need to run a thick(er) oil with a fresh rebuilt engine.
        Unless of course you went on the 'far-side' on the bearingclearances for some reason.
        There's also no reason to run with 80psi of oilpressure all the time.
        Let the oil-pressure gauge tell you want the engine needs.
         
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        • Wyrmrider

          Wyrmrider FABO Gold Member FABO Gold Member

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          a mechanical roller lifter is not nearly as fussy on oil as say a VVT motor
          but the 10 in 10-30 is way obsolete
          run 0-30 modern oil or 0-w40 if you are a corvette going to "track day" or have older larger bearing clearances
          royal purple or whatever

          the link in Hughes #5 (above) is broken
          Hughes #8 looks good give it a careful read
           
        • brian6pac

          brian6pac Well-Known Member

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          Didn't notice the date in the corner of #5 is 2014 so that is probably why the link is broken.
          Be careful of tight clearances on old mopar blocks, I have seen spun main bearings from tight clearances and that is a block killer. When making a lot of torque and power the block will get some twist and the mains will get out of line. If you have a tight clearance the crank will rub the bearing pushing the oil out and will get hot and grab the bearing and it's all over. I would rather run the mains and rods a little loose and run a heavier oil and good pressure 60 psi at 6000 rpm. I have never lost a bearing in any small block even at 7500 rpm.
           
        • BigBlockMopar

          BigBlockMopar BigBlockMember

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          The mid/late-80s stock rollercammed 318 I had in my Dart ran perfectly on 0w20 oil.
           
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          • famous bob

            famous bob mopar misfit

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            I`ve got hughs lifters on my 505 , and use 20w 50 synthetic -----------
             
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            • Wyrmrider

              Wyrmrider FABO Gold Member FABO Gold Member

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              think about that 20w Bob if you start cold
              I used to do 20w-50 in the summer but no longer do
              However it really worked good in a mid 80's VW Waterboxer Vanagon
              everything else would burn oil- go figure
              I rebuilt that motor- got the parts from "Boston Bob" great resource now gone
              NEVER AGAIN on that motor
               
            • Nat

              Nat Well-Known Member

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              TANKS I'LL HAVE TO CHECK THE CLEARANCES using alu molnar rods and forged crank
              link number 8 gives lots to think about
               
            • Wyrmrider

              Wyrmrider FABO Gold Member FABO Gold Member

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              cast cranks are stiff
              forged flex more so I give them more clearance than cast
              point about block flex is well taken
              (think late olds and cads had to have lots of extra clearance)
              and then there is bearing diameter (bearing speeds) and widths
              but that #8 is a great start
               
            • famous bob

              famous bob mopar misfit

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              20w50 , supposed to act like 20 w when cold , and protect like 50 w when hot , that's what I think -----------
               
            • nm9stheham

              nm9stheham Well-Known Member

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              I suspect the lighter weights are to make sure the oil gets readily into the axles in the roller lifters and the axles in the rockers. Since the OP is looking to use a straight synthetic, I think he will be in very good shape. The synthetic aspect of the oil will work better and it will actually be thinner in the temp ranges when the engine is cold and when still warming up, and so will get to those points better than a dino oil.

              Keep an ear open for lifter noise.
               
            • mullinax95

              mullinax95 Well-Known Member

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              I'm running the Eddy heads... Hughes Roller lifters.. roller rockers.. on a Hughes cam in my LA 360 and use Driven 10w30 oil. Have no issues. I will stick with the dino oil.
               
            • Wyrmrider

              Wyrmrider FABO Gold Member FABO Gold Member

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              sticking with the dino oil works especially with a carb engine where you get choke and cold wash down just change it regularly
              However the $20 a jug synthetic at wal mart in 0-30 will show less wear over time as it protects better at start up even in a warm state oil is still "cold"
              BTW in tests we did for the local fire department starting and ideling the trucks to "warm them up" cost $$$ big time compared to start- drive easy- backit down (creating a vacuum) and back up a few times and go- changed the oil too
              oil analysis etc. The oil never got warm ideling- just the water
              and this is So Cal not in the mountains
               
            • Nat

              Nat Well-Known Member

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              Thanks all for the replies , will use 10-30 valvoline racing oil for the forst few months out of storage then change over to the RP 10 -40 . didn't know about the crank flex on forged cranks , I have aftter market bearing caps and a hughes girde just for extra safety , hope the engine lasts , time will tell'
              Thanks all
               
            • mopardude318

              mopardude318 Well-Known Member

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              I was using the Brad Penn 20w50 on my 408 with Hughes rockers and roller lifters. Car is in for paint and motor is on the stand, but I may switch to Bran Penn 10w40 when it's time for an oil change.
               
            • Wyrmrider

              Wyrmrider FABO Gold Member FABO Gold Member

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              0w- 40 spec for the New Corvette is best available
              This is DEXOS 2 which is not Dexos1 version 2
              in Mobil 1 it's ESP
               
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