408 Stroker

Discussion in 'Small Block Mopar Engine' started by wgarland65, Aug 14, 2018.

  1. wgarland65

    wgarland65 New Member

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    Hi, New to the forum and have a few tech questions. I ended up getting a Wrangler barn find for $400 came with a 78 360 .030 over and a bunch of new parts. New pistons Speed Pro H405P flat top 4 relief cuts. I'm researching builds and wanting to get the best performance I can without tons of money. Here are my plans if they work the new pistons are on stock rods, 4" stroker crank, 96 5.9 heads and Hughes 360 whiplash cam. The only thing not written in stone is the crank. The new pistons have a compression height of 1.637in and I research the stroker pistons the compression height is 1.459in. There is .178in more piston on my set. Would having the 4" stroker crank create a drastic issue with valves and head clearances. Any advice is greatly appreciated.
     
  2. 12many

    12many Well-Known Member

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    Just wondering, why is that cam choice in stone?
     
  3. wgarland65

    wgarland65 New Member

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    I've been looking all over the web other mopar sites and like the idle and torque curve this has from tube videos.
     
  4. 72Dart6pack

    72Dart6pack Harder Better Faster Stronger.

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    Just a thought? Maybe go this route? My 408 stroker. Lol

    IMG_24941.jpg
     
  5. rklein383

    rklein383 Well-Known Member

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    My 408! I would help you, but the machine shop purchased my crank, Eagle rods, and KB pistons. I am not sure even what the specs were. Rod

    IMG_4666.JPG
     
  6. MOPAROFFICIAL

    MOPAROFFICIAL Well-Known Member

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    Cam sucks.
     
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    • MOPAROFFICIAL

      MOPAROFFICIAL Well-Known Member

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      Those pistons would be sticking out of the block... but if heads could hold them the cylinder pressure with that wimptrash cam would have it grenading on pump gas

      Get the right pistons for the stroke.
       
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      • replicaracer43

        replicaracer43 Old school member

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        Stock pistons are not gonna work with a 4" crank
         
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        • wgarland65

          wgarland65 New Member

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          Thanks guys, I've got the stock crank. What would be a good cam recommendation it's going in a Jeep Wrangler with 5 speed. I don't need a ton of horsepower but it would be fun. I guess I didn't get lucky enough to get a stroker in all the parts I got. Just wasn't sure .178 was going to create that much of a change. Great looking motors.
           
        • Wyrmrider

          Wyrmrider Well-Known Member

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          dont think about a cam till you get your pistons and compression ratio worked out
          what kind of jeep use, what gears, tires
          lots of difference with a rock crawler application and a off road racer or snow plow
          do you have a 4" stroke crank
          the piston stock crank combination will give you a very low compression ratio
          Speedpro h116cp or kb107 are the pistons that will get ya there..
          Speedpro H405 pistons, what to expect for performance?
          do some research
          which heads- casting number please
          do the math- get the results you MUST learn how to calculate deck height/clearance, compression ratio, etc
           
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          • 1994redram

            1994redram FABO Gold Member FABO Gold Member

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            Why build a stroker? I owned a jeep for awhile and had a complete good know magnum to swap in. Realized i didnt want to upgrade the whole drivetrain. So i left it alone and got rid of the magnum.

            The stock 5 speed will likely grenade, then the axles, driveshafts, the transfer case is probably a bit too weak also. Why don't you just build the 360 and use the new pistons you already have. Throw some magnum heads on it if you desire. Or find some X or J heads and have them cleaned up and put a mild cam in it. It'll be very cheap since you have most of it from the sounds of it. And if you truly need more power you can always build a 408 while you are driving the jeep around with a 360.
             
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            • Fisher

              Fisher Old Guy with a Cool car.

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              What headers are those?
               
            • Wyrmrider

              Wyrmrider Well-Known Member

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              good question
              I usually did the center two over the outside two and the intersection of the outside two looks questionable