Post Mortem on a 360

Small Block Mopar Engine

  1. missing linc

    missing linc Well-Known Member

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    So I finally got the 360 out and on a stand to finish teardown. Beyond the obvious corrosion from water intrusion, the excess coolant in the oilpan was the result of a crack in the wall of cylinder 1, my guess is it was created by too much nitrous. All main and rod bearings were trashed, with number 3 connecting rod bearing being reduced to the size of a nickel, and the corresponding wasting of the crankshaft throw. I also found that the oil pump pick up tube was loose enough that it appeared to have rotated slightly, potentially leading to oil starvation and maybe the catalyst that lead to the eventual death of the motor. Inside the timing cover is spotless, as are the bottom sides of the pistons, so I don't think this motor had a very long life. Also had a Comp 274h cam. All scrap metal now. 20190421_134924.jpg 20190421_153819.jpg 20190421_153755.jpg 20190421_134948.jpg
     
  2. pishta

    pishta I know I'm right....

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    360 blocks are out there. But any trashed motor is $$$ down the drain.
     
  3. missing linc

    missing linc Well-Known Member

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    Yup, 360's are not hard to find around here.
     
  4. brian6pac

    brian6pac Well-Known Member

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    That's ugly
     
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    • RustyRatRod

      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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      Looks like a Wendy's Frosty.
       
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      • nm9stheham

        nm9stheham Well-Known Member

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        The motor rotated the pickup on its own.. it preferred a quick death to picking up any more of the chocolate in the pan LOL
         
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        • toolmanmike

          toolmanmike FABO Staff Staff Member FABO Gold Member

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          Yep that's ugly. You'll have that with nitrous.
           
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          • stixx

            stixx FABO Gold Member FABO Gold Member

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            Another thing comes to mind looking at the brown... matter lol.
             
            Last edited: Apr 23, 2019
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            • brian6pac

              brian6pac Well-Known Member

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              Thanks! I'll never eat a Wendy's frosty again. LOL
               
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              • Krooser

                Krooser Reform School Graduate

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                Fix the crank.. sleeve the block.
                 
              • Wyrmrider

                Wyrmrider Well-Known Member

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                that's what sleeves are for
                crank grindable or does it need welding?
                 
              • missing linc

                missing linc Well-Known Member

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                Probably will need to be welded, reground, if I can't find another complete engine cheap enough I may try sleeving and repairing the crank, or may go stroker crank too. Have also contemplated going 3g Hemi. Budget is the biggest consideration, as with most builds, but I think I can recover some of the cost of a hemi by selling off the small block parts I no longer would need.
                 
              • missing linc

                missing linc Well-Known Member

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                FOCL, too funny!
                 
              • MOPAROFFICIAL

                MOPAROFFICIAL Well-Known Member

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                Tear it apart, let's see the no.1 cylinder crack.

                All it take is some cavitation in the right spot and the rest of the wall no matter how thick will fall out.

                Detonation is a 1,000lb hammer.
                 
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                • Dartnut

                  Dartnut Don't hate me because i'm beautiful

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                  What a mess inside, but you expected that..........
                  I'll give you a call this weekend.
                  I'm sure that i have a decent 360 short block that you can build for cheap..........
                   
                  Last edited: Apr 23, 2019
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                  • Wyrmrider

                    Wyrmrider Well-Known Member

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                    If yours is decked, line honed or any other special machine work sleeve the block
                    Is the rod blue or ok?
                    get back on the track instead of spending all race season on a new build
                    maybe build the stroker for next year
                    work with Krooser- he knows how to race with a tight fist
                    btw that old school comp 274 was out of date new in the box
                    old school is a polite way to say a chevy regrind on a mopar lobe
                    IDK if that lobe was a UDHarold lobe or not- the 268 HE is but also obsolete of us Mopar lovers
                    putting on flame suite
                     
                  • missing linc

                    missing linc Well-Known Member

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                    My opinion is simply that this block is already weakened, so I don't like the idea of putting more money into it. If I don't get anything together this year, I'm ok with that, I can't spend more than I have, and I am patient beyond words. I'll work on the body damage, get it fixed and keep my options open.
                     
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                    • missing linc

                      missing linc Well-Known Member

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                      Yup, no real big surprises, we'll talk this weekend, forecast is for snow anyway.
                       
                    • missing linc

                      missing linc Well-Known Member

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                      I have no idea what has been done to this block as I bought the car as is, not running, parked for 7 years or longer, but from what I'm seeing I doubt it had any big money put into it, just a quick, cheap go fast and hope it lasts build. Stock 360 crank, .040 over pistons, cheap headers, best parts are the 340X heads, MSD, and the Demon carb.
                       
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                      • Wyrmrider

                        Wyrmrider Well-Known Member

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                        It' would have to take a minimum hone and be able to reuse pistons to use that block with a sleeve
                        If I had to bore the whole thing and new pistons I'd start over too
                        I can do sleeves myself which does make a difference
                         
                      • missing linc

                        missing linc Well-Known Member

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                        The amount of rust in the cylinders would likely be deeper than a light hone, so I don't see much sense in re-using this block. If it were a numbers matching 340 6 pack I would be inclined to try saving it, otherwise start fresh.
                         
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                        • Wyrmrider

                          Wyrmrider Well-Known Member

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                          Depends on if the block is blueprinted, decked, line honed etc
                          he has been using that chocolate shake rust coating
                          I doubt if it has rusted enough that even a bottle brush would clean up
                           
                        • missing linc

                          missing linc Well-Known Member

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                          20190424_091615.jpg 20190424_091611.jpg
                           
                        • missing linc

                          missing linc Well-Known Member

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                          On closer inspection, there are 2 cracks in cylinder 1.
                           
                        • MOPAROFFICIAL

                          MOPAROFFICIAL Well-Known Member

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