The "Throw Away 318"

Small Block Mopar Engine

  1. 89on35s

    89on35s Inferno Red Duster FABO Gold Member

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    For a couple years now, I have been deep into building an aluminum headed 360 for my Duster. Long story short after 5 minutes of cam break in there is a hole in the oil pan and undetermined damage in the crank case. Maybe I’ll figure it out this winter.

    So, what do I do now? I can’t go all summer without my Duster! That is not an option for me. I had an old 78 318 sitting in the corner with no purpose in life. The old “Throw away 318”! I think it used to be good! Don’t really remember. It hadn’t been in a running vehicle forever! Hell let’s do it!

    So, up on the engine stand she goes for a quick scrub up. I didn’t even paint it. It got a Summit K-6901 cam kit 218/228 @50, 441/441 lift on a 114 LSA. It got a Edelbrock Performer 318/360 intake because that’s what works with my AC compressor brackets. It got a Melling HV oil pump with matching distributor drive shaft and a new oil pickup and pan because I didn’t have any car stuff that wasn’t for a 360. Between what I had and what I bought I dropped about 500 bucks on the old “Throw away 318” just hoping for the best.

    Well I put it together, dropped it into the car and man, I am super impressed with it for what it is! It doesn’t have great hot idling oil pressure but still has about 10lbs at 800 rpm (180* temp).

    With the 4.10 rear gear and the 2.70 first gear in the A-500 it is a blast to drive around town It’s certainly better than the old wore out 360 with the wrong cam that that I had last year. I have been very nice to it so far, but It seems like it might run out of steam at RPMs over 5000. With the tiny valves that’s probably no surprise. I will drive it like it is for this year and maybe next year. Not sure on the fate of the whole 360 program now that this is so much fun and such a sweetheart to cruise. I will take it to the track and see what times it runs, and I am curious as to what kind of fuel economy it might get. It runs about 2100rpms at 65mph with the OD on. I picked up a NOS cheater plate and the parts to go with it a while back. Maybe I will try a 100 shot on this motor, Not sure yet!

    I am very interested in what this engine might do with new rings and bearings, home head clean up and the ever-controversial swapping of the pistons side to side like Uncle Tony suggests. It would be a fun side by side comparison. I guess I’ll see how the motor works out in the long run. I have 800kms (500 miles) on it so far and things seem good. I did notice some oil by the breather on the drivers side valve cover, I hope there isn’t too much blow by pressuring up the crank case. I’m going to look into that tomorrow.

    Cley
    20210615_203302.jpg
     
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    • 318willrun

      318willrun Utube channel 318willrun

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      Nothing like an old stand by.... to get ya by !! Sounds like it's worth a re-ring job, and maybe a valve job too !!!
       
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      • TT5.9mag

        TT5.9mag Two atmospheres are better than one

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        What?! No pic of the blown up 360 or the trash can 318? Come on man.
         
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        • Heywodja

          Heywodja The Heartbeat Stops Here FABO Gold Member

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          I could use a good valve job from an old standby right about now!
           
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          • 89on35s

            89on35s Inferno Red Duster FABO Gold Member

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            The carnage!
            16239698053248988868131071200235.jpg
            The overachiever!!!!!
            16239698897252892161270209789904.jpg
            Cley
             
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            • TT5.9mag

              TT5.9mag Two atmospheres are better than one

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              Ok now we’re talking. I like the overachiever. Looks like 360 killed a rod and sawed through the pan. Ask me how I know.
              image.jpg
              image.jpg
               
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              • volaredon

                volaredon Well-Known Member

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                And for the "318 haters" and the toss the 318, "HAVE TO run a 360" crowds. The 318 isn't as bad as many claim. In my experience the 360 has been nothing but a gas sucking pig.
                 
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                • Don K

                  Don K Well-Known Member

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                  My wife came out to the shop the other day and asked "why do you have 3 engines just sitting there" Now we know.
                   
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                  • 496 polara

                    496 polara moparts id gch

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                    Slap those aluminum heads on the 318..........
                     
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                    • Darter6

                      Darter6 Well-Known Member

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                      I like my Teen ! IMG_2802.jpg
                       
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                      • dartfreak75

                        dartfreak75 Restore it, Dont part it! FABO Gold Member

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                        That is awesome! I love this thread especially with the growing number of 318 hate threads this one is perfect! Iv always loved 318s and this is exactly why they are always trusty and reliable even if they have been on an engine stand for God knows how long !
                        Sorry about the 360 tho that really sucks it blew!
                         
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                        • MrJLR

                          MrJLR Built, not bought FABO Gold Member

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                          Gotta love the mighty 318!

                          Jeff
                           
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                          • SlantedDart

                            SlantedDart Well-Known Member

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                            Nothing wrong with a 318.. I just got done doing a v8 318 .30 over swap. 360 head 270/270 cam with a 3600 stall and I’m impressed. Very smooth. Previously I had an LS swapped mustang with a cam ran 10.70 on all motor. Im impressed with this little 318 despite having ls power before lol. Little bit of spray and I bet this little dart could yank a tire off the ground
                             
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                            • 89on35s

                              89on35s Inferno Red Duster FABO Gold Member

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                              All the 318 hate kinda prompted me to post this! Sometimes you gotta run what ya got!

                              Cley
                               
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                              • MOPAROFFICIAL

                                MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                                Probably eat more oil than it does now.
                                I usually check and or replace bearings with deals like this, who knows... you get it together and it fires up with a rod knock or squeal from a spun bearing and rod on crank slam dancing .

                                They all run good if you build them right. The 318 gets more attention being trashed on than it ever did in past.. so take that into consideration !
                                 
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                                • 89on35s

                                  89on35s Inferno Red Duster FABO Gold Member

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                                  Since we are at it, I'm going to try this jewel too!

                                  Cley
                                  20210617_203307.jpg
                                   
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                                  • rumblefish360

                                    rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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                                    And it is just that simple. How some people miss that is beyond me.
                                     
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                                    • dirty white boy

                                      dirty white boy 50 yr old Juvenal delinquent

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                                      to many folks mopar'in on a bow-tie bank book....only reson to build a 318....lolol

                                      its a friggin joke!! lighting up and lol a lil and quit red x'in a joke!
                                       
                                      Last edited: Jun 24, 2021
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                                      • mygasser

                                        mygasser FABO Gold Member FABO Gold Member

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                                        and the inlet that went with them too.
                                        future for the 318? 390 stroker?
                                         
                                      • RAMM

                                        RAMM Well-Known Member

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                                        You didn't hear or could tell that something was going wrong and to shut it down? This could have been caught way before a rod punched a hole in the oil pan. J.Rob
                                         
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                                        • fratzog lover

                                          fratzog lover Well-Known Member

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                                          What weight oil is in the old standby?
                                           
                                        • Ron_M

                                          Ron_M 1970 Plymouth Duster 318

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                                          Always regretted deep sixing 2 good running 'teens back in the day due to the "340/360 is better mentality" I once had. On the bright side, I have an LD4B and an MP 340 resto cam set aside for a future 318 build.
                                           
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                                          • barbee6043

                                            barbee6043 barbee 6043 FABO Gold Member

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                                            The real funny part of SB talk way back in the 90s i remember several gear head and some real mechanic friends disliking the 360 in favor of the 318 as far as just "good" engines. Sure, back then 340s were common as dirt, and most everyone was for any BB over any SB.
                                            Disclaimer: But that was Missouri, your experience may vary.
                                             
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                                            • 89on35s

                                              89on35s Inferno Red Duster FABO Gold Member

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                                              I never hooked up the headers to the exhaust so it was super loud in my garage with the engine running 2500 rpm. By the time I got over there to turn it off it turned itself off. Definitely a rookie mistake!

                                              Cley
                                               
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                                              • 89on35s

                                                89on35s Inferno Red Duster FABO Gold Member

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                                                20w50 Lucas Hot Rod oil.

                                                Cley
                                                16240444272535605362205193592588.jpg
                                                 
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