6-71 small block build.

Mopar Racers Forum

  1. Cope

    Cope Fusing with fire

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    It begins!

    @Coyote Jack

    I'm ready to order the blower kit and need some advice on what pulleys to get.

    I'm going with the Dyers street/strip kit if that makes a difference?

    8mill belt or 1/2" tooth?
    2 or 3" belt?

    I'd like a pulley combo that is close in tooth count so I can start out with less boost and when i get it figured out swap the pulleys for more boost? Is this even doable?

    Heads will be open chamber cast iron for now. May go aluminum at a later time.
    Pistons are undecided yet. I think I'm gonna look for a different LA 360 long block so I dont have to tear into my existing engine.
    I will just start a new build and keep my 10.5-1 NA engine as a back up for now.

    Anything you think I'm over looking, feel free to let me know.

    Thanks guys!
     
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    • rumblefish360

      rumblefish360 so close yet so far away

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      Congrats and good luck. IMO, start with the stock pulleys and see what you get. If your a tinkerer like me, order up two more smaller pulleys.


      Bigger the better.....

      Yup
      Have fun!!!!
       
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      • 340doc

        340doc Well-Known Member

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        I'm jealous! Keep us posted on the build.
         
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        • dartfreak75

          dartfreak75 FABO Gold Member FABO Gold Member

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          I'd start with that extra 340 block you had laying around!.
           
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          • Coyote Jack

            Coyote Jack Member #55, I'm old FABO Gold Member

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            I would go with a 3 inch belt. I run a 1/2 inch pitch belt but I have been told the 8mm's are better and more choices. As far as pulleys go, I would go with 2 different sizes and start out under driving it and then once I had things dialed in switch them out and overdrive it a little. By that I mean plus or minus 10%. For everyday driving I underdrive mine to 6 lbs of boost and then when I want to have some real fun I crank it up to 10 lbs of boost. The idea of starting with a different block sounds good to me. If everything goes as planned you can always sell the old engine to recoup some of your money. I will state right now that once you have that blower on there and running right you will never take it off.

            Jack
             
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            • Blucuda413

              Blucuda413 Well-Known Member

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              I'm just finishing mine up currently playing with the Hilborn injection before taking it to the track. Definitely go 8mm and 3" belt. There's enough pulleys out there that you can just figure where you want to start and go from there. Mine came with 50 & 52 which is pretty lame but that has since been changed. You have to be a little careful because too much change will require a different length belt.
               
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              • Cope

                Cope Fusing with fire

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                I know 8mill is better but I have a set of 1/2 pulleys on the model A. So right there saves me 300 bucks in tuning cost.

                (8 mill vs 1/2 inch, same purchase price. Just need to decide what I want.)

                Is it worth just going fo the 8 mill belt and pulley set up and just stocking up on new pulleys?
                How much better is it?
                 
              • oldkimmer

                oldkimmer FABO Gold Member FABO Gold Member

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                Good luck 2 ya. Kim
                 
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                • BrianT

                  BrianT Let's go!

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                  Subscribed. Always wanted a blower on a small block Mopar.
                   
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                  • MiradaMegaCab

                    MiradaMegaCab Well-Known Member

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                    I’d run the 8mm
                    43t bottom
                    52t top
                    That’s 17% under driven
                    Boost will be around 7PSI
                    The crank centerline to the snouts centerline will be around 20”

                    A 14408M75 belt might work, but you have plenty of time to figure that out.
                     
                    Last edited: May 18, 2019 at 6:52 AM
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                    • rumblefish360

                      rumblefish360 so close yet so far away

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                      And there’s a guy that KNOWS.
                       
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                      • diymirage

                        diymirage HP@idle > hondaHP@redline

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                        yeah, you should probably see if it fits in my duster first...you know, just for break in
                         
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                        • Cope

                          Cope Fusing with fire

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                          Thank you that just the info I need.

                          Do you have a chart or something, how are you figuring out the pulley to boost numbers?

                          What would the boost be if I switch those pulleys to small pulley on top?

                          Thanks again!
                           
                        • Blucuda413

                          Blucuda413 Well-Known Member

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                          I believe all those charts are on the BDS site. Good info!!!
                           
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                          • Cope

                            Cope Fusing with fire

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                            Well here she is. It's a smog era 360. Looks like the block has never been machined. It had head work at some time but I'm not concerned about the heads. I just wanted a uncut block.

                            Gonna start cleaning her up sometime this week, then I'll know if it's a boat anchor or a good block.

                            A day in the hot tank, smooth out the cylinders, into the blaster, through the jet wash, chase the threads and paint her a nice mopar blue and BAM. one sexy block.

                            Total cost, less than a dollar per cube.

                            20190519_155041_zpska9oe9on.jpg

                            My plan, as dumb and crazy as it seems is to do this super low budget.
                            New rings, internal ballance, forged dish slugs, new bearings, ARP fasteners and bearings.


                            So
                            5 grand induction.
                            2 grand in hard parts
                            Hopefully no cost at the machine shop. Although I'm gonna have to call in all my favors at once and still probably owe him some work in trade but.....
                            7 grand for a 6-71 small block. I guess it could be done cheaper but not by much.
                             
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                            • MiradaMegaCab

                              MiradaMegaCab Well-Known Member

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                              Swapping the upper and lower pulleys will be 20% over driven, resulting in boost somewhere around 17PSI.

                              What head gaskets are you using? Cometics need a special deck and head surface machining to work properly.
                              If you’re not gonna have the machine work done, run a FelPro 1008 head gasket with the 7PSI of Boost.
                              If you’re gonna run the 17PSI of boost then run a SCE gasket.
                               
                              Last edited: May 19, 2019 at 8:42 PM
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                              • Cope

                                Cope Fusing with fire

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                                Thank you!

                                I doubt I'll ever push it to 17Lbs. I'll buy new pulleys before I get that crazy.

                                I'm gonna order the kit in the morning. Dyers said 2-3 weeks out. So that will give me some time to get the block prepared order some parts.

                                Thank you for your advice, I'm gonna need all the help I can get!
                                 
                              • MiradaMegaCab

                                MiradaMegaCab Well-Known Member

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                              • Cope

                                Cope Fusing with fire

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                                Will they seal with a standard finish?


                                Thank you!
                                 
                              • Krooser

                                Krooser Reform School Graduate

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                                I used a Gilmer belt with my Dyers drive kit on my early Hemi.

                                8-1 compression...
                                The cam came in at 113 lsa.

                                I'd have to swallow hard if I spent that $$$ on my blower deal...I had under $1500.00 in mine but I shopped around...paid $20.00 for my 6-71 after I pulled it off a salvaged Dodge truck.

                                I've sold several blower cores to Gary Dyer ... neat to see all of his shop equipment. His son runs the deal now ..
                                Good people.
                                 
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                                • Cope

                                  Cope Fusing with fire

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                                  Trust me I've done the math many different ways. I have a 6-71 blower core hanging on the wall but I'm just gonna suck it up and spend the long dollar on this.

                                  They're just not cheep like they once were.

                                  It's not realy 5K, the kit is 3,700.00 for everything. But I traded some parts for some other parts and I'm counting that as part of the blower cost.

                                  Just a good small block intake is 1,500.00 if you can find one..
                                   
                                • RustyRatRod

                                  RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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                                  Even my build thread has more pictures and less blab than this. Lame.
                                   
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                                  • Krooser

                                    Krooser Reform School Graduate

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                                    I sold my cores to Bill Dyer for $250.00 each.

                                    Rick Dean at Dean Blowers did the gas conversion for $425.00 plus I bought a used rear bearing plate from him and gaskets.

                                    I milled up a 4x2 carb plate to use four Stromberg 97's but settled on a single AFB.

                                    The drive kit I bought on fleaBay for $350.00...new from Dyer's. That was a deal.

                                    I found an old speedshop in Mass that had an old nib Cragar manifold that I got for $250.00.

                                    Just couldn't afford to do it any other way.

                                    Dean Blowers
                                     
                                    Last edited: May 19, 2019 at 11:52 PM
                                  • Cope

                                    Cope Fusing with fire

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                                    Because this is for information.
                                    When I have pics I post em. Right now this is about planning.

                                    Here's a pic for ya, everyone like dogs right?

                                    20190511_205749_zpshjmogsxw.jpg
                                     
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                                    • RustyRatRod

                                      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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                                      blah blah. blah blah blah. lol

                                      and yeah, dogs are ok by me.
                                       
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