My 1971 Duster 6.1 Hemi build

New Hemi Engine Swaps

  1. JBrian

    JBrian Well-Known Member

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    I’ve had a 6-cylinder Duster sitting in my garage for several years after selling my matching numbers 1971 Duster 340; GB2/GB7/white stripes bench/blue printed 340 w/pocket ported heads/XE268 727/3.55s. It was a great little Duster that ran 13.60s @ 102Mph and was in the Dodge Dart & Plymouth Duster Musclecar color history book, Johnny Lightning Mopar Muscle 1/64” and also in Mopar Muscle. Eventually I just tired of it and didn’t want to modify it. I sold it several years ago and bought the 6-cylinder DUster with the idea of building a FAST clone that was streetable. I was looking for 11.80s @ 118Mph in a drivable combination. This project stalled with two kids in college (Texas A&M and University of Texas grads) and then other priorities.

    This past summer my wife was getting the itch for a new Plum Crazy shaker hood Challenger 6-speed; so we drove a Tor-red one and probably would have bought it if it was the right color. She really wanted something to drive with modern convinces. I told her we could build the Duster for about the same price with a Gen III Hemi or look for a Challenger that would meet her requirements. End of story, build the Duster!

    Lucky for me, Uhcoog1 (Wade) and Alex, both into Gen III Hemi conversations were close by. I drove Wade’s car this past July and was hooked on the conversion as well as moving more toward a corner carving, stiff Unibody car.

    I’ll start with a little history; my first car, a 1969 GTX in 1974 (As we refer to as “Back in the day”), a 13.50's @ 105Mph car at Connecticut Dragway and it's untimely death!

    More pictures of my 1971 Duster 340 from the 2000's and of the 370 Hemi Duster build to come!
     

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  2. JBrian

    JBrian Well-Known Member

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    1971 Duster 340 as purchased in 1999:
     

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  3. JBrian

    JBrian Well-Known Member

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    After restoration in 2001:
     

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  4. JBrian

    JBrian Well-Known Member

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    Show & Go!
     

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  5. JBrian

    JBrian Well-Known Member

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    Some more:
     

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  6. JBrian

    JBrian Well-Known Member

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    More:
     

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  7. JBrian

    JBrian Well-Known Member

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    370 Hemi Duster Gen III block/head mockup with Borgosen steering box and Wade's old TTIs
     

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  8. JDMopar

    JDMopar Well-Known Member

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    Looking good! How much room do you have between the #1 cylinder header tube and the steering box? I'm doing a 5.7 in a 70 Duster. I'd love to have PS, but it might mean completely reworking my drivers side motor mount. I modified the drivers side TTI spool motor mount and the saddle on the k frame, so the AC condenser would fit in the stock location on the Hemi. I might call TTI, and see if they could send me a side by side pic of their drivers side header like mine, and a Borgeson PS box header. Keep up the good work on your Duster. :prayer:
     
    • Thanks! Thanks! x 1
    • goldduster318

      goldduster318 Overzealous Car Modifier

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      Hey there...I remember you from when you had the other Duster.

      It looks like you are running into the same thing I have (and have many other people with the 1st gen Borgeson box), of needing to shim it. I haven't done mine (it drives fine without shimming), but it will help with the clearance to the block and headers.
       
    • JBrian

      JBrian Well-Known Member

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      Nada! I expect the "new" TTI that is now being produced will give some clearance!
       
    • JBrian

      JBrian Well-Known Member

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      K-Member with Firm-Feel reinforcement kit, powder coated:
       

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    • JBrian

      JBrian Well-Known Member

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      6.1 Hemi Bullet with Hughes ported heads:
       

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    • JBrian

      JBrian Well-Known Member

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      Here is a bracket we made to hold two 4" coaxial speakers where the stock 4" x 10" speaker goes. Will be boxing the sides next:
       

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    • JBrian

      JBrian Well-Known Member

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      Here are a couple of more pictures of the under carriage after media blasting:
       

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    • JBrian

      JBrian Well-Known Member

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      Checking how the Helwig 1 1/4" swaybar mounts to the LCA's without swaybar tabs:
       

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    • JBrian

      JBrian Well-Known Member

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      Recovering the rear bench seat with Legendary Black/Charcoal:
       

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    • JBrian

      JBrian Well-Known Member

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      Cut off the 6-cylinder VIN tag and saved the star rivets. Will epoxy the VIN onto the 340 Rally Dash that I'm restoring.
       

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    • Uhcoog1

      Uhcoog1 Well-Known Member

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      Looking good!!!
       
    • JBrian

      JBrian Well-Known Member

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      Metal work almost complete; US Car Tools front brace and core support:
       

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    • JBrian

      JBrian Well-Known Member

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      Torque Boxes, sub-frame connectors, bucket seat braces:
       

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    • JBrian

      JBrian Well-Known Member

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      Trunk floor extensions. Passenger front floor pan being finished now and then the passenger side sub-frame connector will be welded in. By the way, the sub-frame connectors are actually a heavier gauge metal than the original frames:
       

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    • JBrian

      JBrian Well-Known Member

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      Core support cut out to accept the 26" Champion 5.7/6.1 radiator. All metal work should be completed this week; a milestone! I'm currently looking at Lizard Skin sound control coating and ceramic coating (Where appropriate) on both the sides of the floor pan as well as the firewall, trunk and roof.

      I ordered my rear springs from Peter Bergman and dropped off my 742 323 clutch type suregrip with a friend of mine who has been rebuilding and assembling them since the 1970's! Yeah, w'ere not spring chickens anymore. Will finalize gear ratio (3.73/3.91) depending upon tire size. I've decided to go with the '68-'70 B-Body 8 3/4":
       

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    • Rengo

      Rengo Well-Known Member

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      I always liked the idea of a new school engine in an old car, but I am too scared to try this myself. I just wouldn't know where to begin.
       
    • 4speeds4me

      4speeds4me Well-Known Member

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      Find a great deal on a GenIII and start grabbing parts. It's working for me so far!
       
    • 72BBSwinger

      72BBSwinger Well-Known Member

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      Don't forget a 1/16" shim on the 2 inner bolts of that steering box, will make it straight and add more room at the same time.
       
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