360 Build suggestions

Small Block Mopar Engine

  1. C2ndLTpigeon

    C2ndLTpigeon Mopar or no Car! FABO Gold Member

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    So after spending some money trying to build a 318 and hearing the "you should just build a 360" opinion and I finally fell for it. I managed to pick up a 360 with 727 for a good deal to replace my 318-904 set up. This is a street car that needs some more power than the whiplash 318 im running.

    I'm looking for a good build suggestion. It would be nice to have compression in the 9's I would like to keep costs down so I plan to use stock Iron heads with 1.88 1.60 valves with some port match and bowl clean up. Stock crank and rods are good for reuse.
    Looking for piston options and cam options.
    I have the following components that I plan to reuse with the 360: Headers, Protronix distributor, Performer air gap intake, edelbrock 600 (probably going to need bigger) and I cam running 3.55 gears in the rear.

    Thanks!
     
  2. rumblefish360

    rumblefish360 So close, yet so far away FABO Gold Member

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    Can you post the Whiplash cam card?

    What is the goal for the car?
     
  3. C2ndLTpigeon

    C2ndLTpigeon Mopar or no Car! FABO Gold Member

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    Mainly a street car, but I might take it to the 1/8th mile once in a blue moon.

    Here is the specs on the 318 whiplash im running.
    SMC1326AL.jpg
     
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    • rumblefish360

      rumblefish360 So close, yet so far away FABO Gold Member

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      Ok... are you interested in going with an upgraded converter?
      Is there a particular time slip to chase?
      Is a mechanical cam OK?
       
    • C2ndLTpigeon

      C2ndLTpigeon Mopar or no Car! FABO Gold Member

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      I could upgrade the converter at a later point.
      No there is no goal time its just for fun and it will be more towards a street car with some oomph
      I would like to use a mechanical flat tappet cam still.
       
    • rumblefish360

      rumblefish360 So close, yet so far away FABO Gold Member

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      Without a converter change....
      Comp Cams 20-246-4. (270S)
      A SFT “Magnum” series cam.
      1800-5800 rpm
      270/270 (224/224@050) .468/.468 - 110

      With a minor converter upgrade, 2500 stall...
      Comp Cams 20-233-4 (XE268S)
      2-6K 268/274 (230/236@050) - .488/.501 - 110

      In the future, if a better set of heads enter the picture, use the best heads available, & use 1.6 rockers. I’d get the rockers now if you don’t already have a mechanical rocker set.
       
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      • C2ndLTpigeon

        C2ndLTpigeon Mopar or no Car! FABO Gold Member

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      • rumblefish360

        rumblefish360 So close, yet so far away FABO Gold Member

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        I’m using those Federal-Mougal slugs in the wife’s 360 now @ zero deck. TF heads up top. Go for the EPS finish. 6E01AB66-9C2D-489B-9EFA-E395D49216B5.jpeg A3382230-C307-4151-A25A-1CE1ECEEA4D3.jpeg DE7781B9-CB68-4CAD-AA87-B5249CD39AC5.jpeg C5CFAFC2-AD02-4602-874D-AFC749F7FB06.jpeg 24AE2EC1-A240-43C3-8843-01854290F59D.jpeg D7D33E81-3A02-48E2-918C-9BD65221C676.jpeg
         
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        • Jadaharabi

          Jadaharabi FABO Gold Member FABO Gold Member

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          Since it is internally balanced I would use the 904 and converter behind it. Along with the flex plate.
          The 904 takes less power to drive it then the 727. Free horsepower to rear wheels by using the 904.
           
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          • Ricks70Duster340

            Ricks70Duster340 Child of the King, widower FABO Gold Member

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            You will be fine with the 600CFM carb. Too many psych themselves into bigger is better. For the street, you'll almost always be happier with a smaller carb. Better economy, better low end response. If you look at one of the carb sizing calculators, you'll see just what size is optimal for your setup.
             
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            • Demonracer

              Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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              I agree with Jadaharabi, build the 904 with a good converter to be a stout transmission & it will serve you well, lighter weight, less HP to drive & less reciprocating mass.
               
            • Brooks James

              Brooks James Dustoff

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              Get forged pistons and slap a 100hp nitrous kit on it.cheapest horsepower out there. Turn you grocery getter into a tire fryer on command!!
               
              Last edited: Apr 29, 2021
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              • AJ/FormS

                AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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                You want cheap?
                Install the KB 107s, get the Scr up to 8.8 or better, and the Q to either less than .045 or more than .080, and just slap all your 318 stuff onto the 360 including that 318whiplash cam; 213/226/109+5. This may gross up to an advertised of near to 260/272@ .008, I'm guessing.Add a 2800TC and have some fun.

                Ok that's what I would do on the cheap with parts you already have.
                 
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                • rumblefish360

                  rumblefish360 So close, yet so far away FABO Gold Member

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                  Using the kit just minimize’s down time. You’ll end up with an extra rotating assembly that is not worth much on a resale side being a stock cast crank and the OE rods which my not or may not be straight. Correcting such parts for use or reselling can be costly. Depending on there condition. IMO, disassemble the engine first to see what is good to go and then proceed from there.

                  The kit could be cheaper.
                   
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                  • mygasser

                    mygasser FABO Gold Member FABO Gold Member

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                    agreed, for cheap i once used a 600 holley on a 440 and the throttle response was much better than the borrowed 750 i had on there. i only noticed a performance drop around 5000rpm ish and up where it 'flattened' off the power. on a 360 it'll be fine.
                    neil.
                     
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                    • mygasser

                      mygasser FABO Gold Member FABO Gold Member

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                      and the 904 will bolt right up to the car it came from compared to swapping in a 727.
                       
                    • SLOPAR72

                      SLOPAR72 Well-Known Member

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                      Use a SFT and nitrate it.... It will help get you over the Zinc hurdle during break in.... Since this is a street bruiser and you have a goal I would go minimum mid 9's on Static compression. The Solid cam will put you in adjustable rockers so keep an eye out for a clean set of used from this site....

                      904 is a good option as is putting a few bucks towards a decent converter. That's what can turn it into a tyre fryer and of course if you want to up the ante gap the rings during assembly for a good 100 shot of gas...

                      JW
                       
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                      • yellow rose

                        yellow rose Overnight Sensation FABO Gold Member

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                        I would talk to several people before I did a nitride treatment of the cam. IIRC it makes the surface hard but there are some fracture issues under the hard layer.

                        If you are going to do some bearing on it you can cryogenically treat the cam and lifters. Or go to a steel cam and use the appropriate lifters.

                        It’s actually cheaper to do a roller cam when you get there. And it’s infinitely more durable.
                         
                      • volaredon

                        volaredon Well-Known Member

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                        Dump the 360
                        Build the 318.
                        Had to, I'm so damn tired of hearing how "bad" of an engine the 318 is. The 318 had been plenty of engine for at least a gazillion owners of them over the years.
                         
                      • autoxcuda

                        autoxcuda Well-Known Member

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                        • gzig5

                          gzig5 FABO Gold Member FABO Gold Member

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                          I see it says balanced but I don’t see the word internal. It’s a cast crank on that kit. You might want to verify internal or external
                           
                        • Jadaharabi

                          Jadaharabi FABO Gold Member FABO Gold Member

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                          .
                          Under additional information it says internal balanced.
                           
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                          • C2ndLTpigeon

                            C2ndLTpigeon Mopar or no Car! FABO Gold Member

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                            Im still trying to decide and am in no hurry, I agree that for a few more bucks a stroker kit could be had. If I went with a stroker I would like to get some aluminum heads but would need to save some pennies first.
                             
                          • autoxcuda

                            autoxcuda Well-Known Member

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                            you don’t have to buy aluminum heads. You could run your 360 heads. BUT go get an estimate from a machine shop to rebuild your 360 heads.

                            problem with stock cast iron J/X heads is they have a much larger combustion chamber, ~72cc, than any common aftermarket aluminum head; 63-65cc. So if you are running 9.5:1 compression on CA pump gas, upgrading in the future to an aluminum head puts you at too much compression for the same pistons.

                            That head situation goes for a 360 or stroker. Same issue both of way.
                             
                            Last edited: Apr 30, 2021
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                            • RustyRatRod

                              RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                              If you can find one, the MP .528 cam is fantastic. If not, Oregon Cam Grinders has a grind real close.
                               
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