1. replicaracer43

    replicaracer43 Grumpy Old Man

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    There is a LOT better talent in a bunch of members right on this site, and you can find ANY answer to any question with a simple search here.
     
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    • Princess Valiant

      Princess Valiant Duster specialist FABO Gold Member

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      The side by side comparison was really nice because I had often wondered what the difference is and seeing the side by side really puts the visual in my brain
       
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      • replicaracer43

        replicaracer43 Grumpy Old Man

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        I did my first LA to magnum swap in about 99 or so, and I have often said even on this sight, a running junkyard magnum is the budget guys best option.
         
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        • Keystone

          Keystone Well-Known Member

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          I haven't watched the video, but it seems to me if your replacing a worn out 318 or upgrading from a slant, using a cheap and readily available Magnum makes a lot of sense. Not everyone wants to build a race motor. Refurbished to stock specs and you have better flowing heads, more compression, roller lifters... And for saving money you can even drill the heads and reuse an old LA intake manifold.
          That's what I'm in the middle of anyway. I'll let you know how it goes when it's all done, but so far I have no regrets on going with a 5.2 instead of a 318 LA.
          20210919_130355.jpg
           
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          • jos51700

            jos51700 Green Bearing thread connoisseur

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            The magnum has much potential beyond and above the LA, namely roller cam, 1.6 ratio rockers, and the heads, although crack prone, are superior to any LA casting. Personally, I wonder if the cracking issue wasn't less of a thing than the internet made it out to be, namely because EQ or somebody would still be cranking those out if there was money to made there. I almost wonder if, for a many magnums are still out there, if the ones with terminal cracking have been filtered out. Disclaimer: I've not read up on why EQ got out of the game.

            If I'm going V8, I'm going aluminum heads. If performance is what I'm after, do it right. If not, a bone stock slant 6 is fine.

            All that said, I've vowed never to run another LA, but if I swap again, it'll probably just be to a gen III hemi, namely because they're still in production so the parts will be around longer than the magnums, but also if it's a power game, they win.
             
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            • MOPAROFFICIAL

              MOPAROFFICIAL FABO Gold Member FABO Gold Member

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              It's no big deal, but its funny....to read people accept the magnum and over look the springs while they would never do that with the older LA motors. Nope... its ..."i would be changing the springs right away and sliding in that 256 or 262 cam and lead footing it off into the sunset..."
              So I wanna know if these people are really tossing in a magum engine and just driving it with the stock cam and springs of which 'the stock springs are done and floating after 4500 rpm' while the stock cam is still there till about maybe 5200 rpm. 1st thing I did was change the springs and put some heads on. It pulls into 5500 range now.

              My advice to all you guys buying one of these engines put it on the stand , change the oil pump , timing chain, remove heads and do the spring work whether changing the cam or not. It will turn more rpms qith more spring. The 986 comp double 1.437 is a good one to about .500 lift/55-6000rpm, after that get a better spring with more open. Those are only about 290's lbs open but have 130 seat lbs.
              I would not put 500 into any stock casting magum head...so be sure they are good to begin with.. if not, get after market sm,eq,rhs,etc
               
              Last edited: Sep 26, 2021
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              • JunkyJimmy

                JunkyJimmy FABO Gold Member FABO Gold Member

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                Hughes has a spring,retainer,locks package that is drop in,good to 540 lift for $200.00
                 
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                • MoparLeo

                  MoparLeo NRA BENEFACTOR LEVEL LIFE MEMBER FABO Gold Member

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                  The Magnum was a truck only application. Low rpm was always in the design. Springs are needed for any serious rpm's regardless of the base engine.
                  Smoother castings and improved combustion chamber and port shape of the EQ heads = more flow...
                  Heads are the key to power on any engine.
                   
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                  • mopardude318

                    mopardude318 Well-Known Member

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                    I like the LA roller cam block if you were to start a new build. Uhhmmm hhhmmmm
                     
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                    • MOPAROFFICIAL

                      MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                      Now just cut the guides down to clear over .470 lift...
                       
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                      • ou812

                        ou812 Well-Known Member

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                        We also have one, not a conical though but fits the OEM rockers, allows .550 lift, 125lbs. installed, and 260lbs. open at .550 lift. It runs 230.00 for the springs and retainers, no machine work and you can use the oem locks.
                        Springs not a big deal...the magnum is a great platform!
                         
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                        • barbee6043

                          barbee6043 barbee 6043 FABO Gold Member

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                          Ever time I rev over 4500 rpm, my wife, riding shotgun, gets nervous and wets her pants! So we just poke along.:BangHead::poke:
                           
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                          • jos51700

                            jos51700 Green Bearing thread connoisseur

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                            I'm kinda dumb. Other than the oiling passage, is there any other difference?
                             
                          • Bobzilla

                            Bobzilla Well-Known Member

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                            Now this is damn good info.
                            Thanks for posting this. I had no idea you guys offered a spring kit.
                             
                          • sireland67

                            sireland67 FABO Gold Member FABO Gold Member

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                          • Bobzilla

                            Bobzilla Well-Known Member

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                            LA hydraulic roller cam block has the same oiling as non-roller LA block.
                            First year or two Magnum blocks actually had LA oiling holes drilled.
                            Remaining Magnum blocks do not have LA oiling holes drilled, but these can be drilled if really desired. LA heads can be used by running the stainless steel, roller tip, shaft mounted LA rocker arms like those by Comp Cams and copied by PRW and Speedmaster, that allow oiling through hollow pushrod.

                            Any Magnum block can be built to replace an LA engine as long as the proper parts are used. If an LA timing cover is used on the front, you can use LA oil pans, oil pump and pickup, water pumps, and v-belt pulley setup. Just make sure a stock 360 Magnum rotating assembly always gets a 360 Magnum harmonic balancer and weighted flex plate so a common neutral converter can be used.

                            If a new LA rotating assembly with forged crankshaft and internal balance is used, you can obviously run the neutral flex plate, harmonic balancer, and converter.

                            If a cast LA 360 rotating assembly is used that is still external balanced, use those LA 360 parts as you would on a full LA 360 build.
                             
                            Last edited: Sep 26, 2021
                          • Bobzilla

                            Bobzilla Well-Known Member

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                            Almost forgot, supposedly a 5.2/318 Magnum rear main cap is externally machined the same as a 5.9/360 Magnum, so both of them accept LA oil pans.

                            The Magnums used much better one-piece oil pan gaskets that can be used with a Magnum timing cover and accessory drive serpentine belt setup, but the Magnum gasket also works well on the LA timing cover with a little extra silicone in the gaps at the front. I have a Milodon LA 360 oil pan on an LA hydraulic roller block. The front oil pan seal holes in the Milodon pan were so far off I could not use the LA gasket setup at all, but the Magnum gasket sealed up nicely.
                             
                          • 318willrun

                            318willrun Utube channel 318willrun

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                            I bought 'em, dropped 'em on stock mag heads, and threw in a regrind cam I'm about .530 lift on exhaust, just got it going and no issues so far, had it to 6k easily.
                             
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                            • MOPAROFFICIAL

                              MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                              Another great option.
                              What the highest lift you would run without cutting the guides down...470 ish?
                               
                            • Mopar Sam

                              Mopar Sam Well Fed Member

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                              One of my sons uses Lunati #73949 springs on his Magnum r/t heads, with Hughes retainers. He runs .575 lift in his daily driven D100.
                               
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                              • MOPAROFFICIAL

                                MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                                R/T heads are a different story. Nice heads
                                The installed height is greater with those and 2.02 intake valves.
                                 
                              • Mopar Sam

                                Mopar Sam Well Fed Member

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                                1.65 installed height on his r/ts, with stock length 2.02 /1.62 valves. That spring # I posted will work with stock mag heads. Original application is for pontiacs, which also have a short installed height.

                                I agree, the r/t heads are good. They took the mess out of the port roof. They also are made such that you can tube the pushrod holes.
                                 
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                                • greymouser7

                                  greymouser7 Vagrant Vagabond “Veni Vidi Vici”

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                                  Where is that please sir? I cannot imagine anything being that cheap at Hughes!
                                   
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                                  • JunkyJimmy

                                    JunkyJimmy FABO Gold Member FABO Gold Member

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                                    Got me, I just looked $219 now and probably $40 freight!!!!
                                     
                                  • 66fs

                                    66fs FABO Gold Member FABO Gold Member

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                                    What do you want to learn?
                                     
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