Mild 360 Magnum Build

Small Block Mopar Engine

  1. 67autocross

    67autocross A new iron curtain drawn across the 49th parallel

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    Starting a mild 360 magnum build, goal is a strong stock stroke daily driver.
    Block is out of the hot tank and the bore was good ...but it will end up going 30 over due to local parts suppliers not having any stock bore pistons... I will Dyno and post results

    71AC46B3-9865-4C8C-A6FA-2EED7564EB57.jpeg
     
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    • Treblig

      Treblig FABO Gold Member FABO Gold Member

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      somebody might have stock pistons here on FABO???
       
    • nm9stheham

      nm9stheham Well-Known Member

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      RockAuto shows Enginetech std bore pistons in stock. Bet there are others that have them.

      If overboring, why not put in something better?
       
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      • Bobzilla

        Bobzilla Well-Known Member

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        If the bores are good, straight and round with no noticeable ridge, why bother paying to bore .030" over and having thinner cylinder walls? Use the cost of boring to pay to get a set of standard bore hyperutectic pistons shipped accross the border.
        Not being negative, just wondering.
         
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        • MrJLR

          MrJLR Built, not bought FABO Gold Member

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          Sweet......!

          Jeff
           
        • rumblefish360

          rumblefish360 so close yet so far away

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          Wow! Everyone shittin on the mans thread and he ain’t even gotten started yet.

          So warm and fuzzy it just makes me want to start a build thread!
           
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          • 1994redram

            1994redram FABO Gold Member FABO Gold Member

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            I went .030 over due to parts availability also. Machine shop said .010 would probably clean up my magnum block. .020 would get it right for sure. My dad had a set of new .030 KB pistons for free so thats what I had done.

            What heads and cam are you using?
             
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            • 67autocross

              67autocross A new iron curtain drawn across the 49th parallel

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              The pistons are silvolites and they had them local along with the rest of the bottom end parts... so I grabbed them. I don’t think the fresh bore will hurt.... plus it keeps the local machine shop opened
               
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              • 1994redram

                1994redram FABO Gold Member FABO Gold Member

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                And you get more cubic inches when bored over! Makes it sound so cool and powerful when you explain what the motor is.
                 
              • 67autocross

                67autocross A new iron curtain drawn across the 49th parallel

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                EQ heads and a lunati cam the J.Rob recommended based on some info I gave him
                 
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                • rumblefish360

                  rumblefish360 so close yet so far away

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                  5.9 into a 6 Ltr.
                   
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                  • jos51700

                    jos51700 Well-Known Member

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                    Rock solid and rigid beats a few more flexible inches any day. ;-)
                     
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                    • Bobzilla

                      Bobzilla Well-Known Member

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                      Sounds like a good plan. I like the Magnum 360 for street builds, so I am looking forward to the dyno results.
                       
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                      • 67autocross

                        67autocross A new iron curtain drawn across the 49th parallel

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                        I will Dyno the magnum this fall, I have to take a 340 out of one of my other cars to re-ring it so I will use the old chrome TTI headers from that car on the dyno.
                         
                      • RAMM

                        RAMM Well-Known Member

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                        Don't you know you're a moron for not putting a 4" stroke steel crank in there? It's practically free and they rpm like crazy--at least that's what I'm told. Also you NEED Edelbrock or some other aluminum heads on that combo or else it won't be much better than a 318 2bl. Also that cam that this J.Rob (sounds sketchy AF to me) recommended better feature an LSA of no more than 101-102 if you want a real driveable and enjoyable engine. Lastly and this one's for YR or Madscientist or whatever screen name he hasn't been banned under--You are a fool if you don't use TS Gapless rings 'cuz why wouldn't you throw away $400-$500 cdn for all the "benefits" LOFL. J.Rob
                         
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                        • RAMM

                          RAMM Well-Known Member

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                          Whoa! Stop right there! Why are you re-ringing the 340? Moving to a gapless top? J.Rob
                           
                        • 67autocross

                          67autocross A new iron curtain drawn across the 49th parallel

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                          I’m just waiting for my inheritance to arrive from Nigeria and I will get me some of those parts... money should be here soon I sent the administrator fees to Western Union.... to someone named J.Rob

                          I could help anyone out who needs a set of .30 over 340 gap less rings, I have a low mileage used set up for grabs ... mint condition, well lubed.
                           
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                          • RAMM

                            RAMM Well-Known Member

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                            What do you mean well lubed? J.Rob
                             
                          • 67autocross

                            67autocross A new iron curtain drawn across the 49th parallel

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                            Look it up on Porn Hub.....
                             
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                            • TrailBeast

                              TrailBeast Slightly Twisted Member

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                              :lol:

                              Your plan will run just fine, and be very reliable at the same time.
                               
                            • nm9stheham

                              nm9stheham Well-Known Member

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                              Sounds like trouble is brewing north of the border LOL
                               
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                              • 67autocross

                                67autocross A new iron curtain drawn across the 49th parallel

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                                While I have the 360 magnum crank in my hand...and at the machine shop, could it be drilled for a bushing in case I want to put a 4 speed on front of it?
                                 
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                                • ir3333

                                  ir3333 Well-Known Member

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                                  i had a friend like that.No matter what i did his immediate response
                                  was "you know what you should have done".
                                   
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                                  • sireland67

                                    sireland67 Well-Known Member

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                                    My stock mag crank was drilled for the input shaft depth.
                                     
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                                    • Wyrmrider

                                      Wyrmrider Well-Known Member

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                                      Stop-Tilt-recheck
                                      Are these silvolites stock compression height or "destroked" rebuilder pistons?
                                      if destroked you mostly lost your quench
                                      did you measure deck clearance on the stock pistons before you pulled it down? what was it?
                                      and BTW what's wrong with re-ringing the stock pistons?
                                      I'm thinking you will need a thin headgasket and even so may not get down to the .030-040 ideal quench distance
                                      so you may end up needing to deck the block- and if you measured all four corners you know if it's square already LA can be all over the place- IDK about Magnum i hear they are better
                                      I used +.020 KBs in one of my last 360 builds but I think that was an LA block not magnum
                                       
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