BOLTS AND SPLINE

Racers Hangout

  1. moparsquid

    moparsquid FBBO Gold Member FBBO Gold Member

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    I have a chance to buy a 8 bolt max wedge crank for a great price but for a few dollars more I can get a lightweight crank from 440 source and im sure its 6 bolt I plan to do a little strip time which would be better also can I get away with using a 23 spline tranny vice 18 spline expensive trannies or could I buy a 23 spline and change over with parts from Brewers thanks
     
  2. 91r/t

    91r/t FBBO Gold Member FBBO Gold Member

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    Tranny wise, I would find a decent 18 spline as there is quite a few parts to change to make it an 18 spline. Cost effective wise, its probably better than buying a 23 and converting if that's the way you wanna go 18 spline. I have beat on mine pretty good and my 23 spline is fine, but the hard launches at the track with slicks might break parts eventually. the 23 spline will take a good amount of abuse.
     
  3. 33 IMP

    33 IMP Well-Known Member

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    My real max crank is a six bolt, the eight bolt is almost certainly a hemi crank. No big, they interchange. But if i was buying a crank, i would prefer to buy a new one, rather than an unknown-how-abused, fifty yearold one. (And i would take the opportunity to buy a stroker crank!)
     
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    • 1 Wild R/T

      1 Wild R/T FBBO Gold Member FBBO Gold Member

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      Or one of the early (59-61) extended flange wedge cranks... Those used eight holes but they are not threaded...
       
    • dvw

      dvw Well-Known Member

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      There is no converting a 23 to an 18. Lots of differences. 23 will hold up on the street pretty well. Drag strip under some abuse. I’ve run a fair amount of mid 12 passes with zero issues. The clutch, tires and weight are the big issues. I have nearly every part to build a slick shifted 18 spline. Every gear is brand new. PM me if interested.
      Doug
       
    • moparsquid

      moparsquid FBBO Gold Member FBBO Gold Member

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      the part number goes to a 426 max wedge the crank came out of an engine that was in BOB ELLIOTS 63 plymouth
       
    • 1 Wild R/T

      1 Wild R/T FBBO Gold Member FBBO Gold Member

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      Max wedge & Hemi use the same crankshaft forging, the differences are in the machining... Max Wedge was 6 bolt, Hemi 8 bolt... Lots of parts swapping happened in race cars...
       
    • zyzzyx

      zyzzyx FBBO Gold Member FBBO Gold Member

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      I would rather have a lightweight 440 Crank! New. and with the right pistons & rods
      you can keep that mass down.
       
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      • moparsquid

        moparsquid FBBO Gold Member FBBO Gold Member

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        im leaning to the 440 source light weight its not to much more and its new and most likely get higher revs
         
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        • F4R/T

          F4R/T Well-Known Member

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          Me personally I don’t care about light weight as I care more where it’s made and the quality. I’ll take the old crank! Clean it up , check it out , machine as needed and balance to a good rotating assembly and you just recycled another part and let China lose again. IMO
           
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          • w.Hudson

            w.Hudson Well-Known Member

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            Also there is an 8 bolt steel crank that was used in a big truck application in an industrial 413.
             
          • 66Satellite47

            66Satellite47 FBBO Gold Member FBBO Gold Member

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            For the crank, the real issue with a factory BB crank is if it is a stock undercut fillet style. As far as I know the Hemi cranks were the ones that used a radius fillet design. Not sure about the "truck" cranks. I used up many stock 440 cranks (7000+ RPM, never broke one, but they eventually cracked, did break a main cap). The alloy would make some difference. IMHO 8 bolt vs 6 bolt doesn't seem to make much difference.
            Never heard anyone really complain about the quality of 440 Source cranks, but I don't have one.
             
          • Fran Blacker

            Fran Blacker FBBO Gold Member FBBO Gold Member

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            Street Hemi cranks had undercut fillet. Kellogg crank had radius fillets. The truck 8 hole crank may extend out the back of engine and won't work in cars. Not positive on that.
             
          • 66Satellite47

            66Satellite47 FBBO Gold Member FBBO Gold Member

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            Guess I may be wrong, but the '70 street Hemi crank I looked at had radiused fillets.
            Other than 8 crank bolts, what was different about a Hemi crank?
             
          • malex

            malex FBBO Gold Member FBBO Gold Member

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            On my RB 505 I went with the 440 source lightweight crankshaft. I chose to go that route for the reduced rotating mass weight as well. So far so good.
             
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            • Fran Blacker

              Fran Blacker FBBO Gold Member FBBO Gold Member

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              Nothing different. Had a chance to buy a Kellogg crank. A dealer closed and my near by dealer took the stock. Called a friend that worked at closed dealer said crank was to bent so they didn't use it.
               
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