Getting started on a 470 stroker, what carb ?

Fuel and Air Systems

  1. MOPARMAGA

    MOPARMAGA Well-Known Member

    Messages:
    317
    Likes Received:
    122
    Joined:
    Aug 20, 2019
    Location:
    Seattle Wa
    Local Time:
    12:16 AM
    Hey fabo friends,
    I'm looking for help picking the right carb for street & strip, I have a guy from fabo that is a builder & going to have him help with the stuff I can't do.
    Here's my build so far;
    70 dart swinger, aiming for 2800 pounds
    630 casting 73' 400 block
    Molnar 3.915 crank
    6.70 rods
    1.320 SRP pistons.
    Compression should be 11.3:1
    I have trickflow 240s
    I have a couple choices for intake, rpm & trickflow track heat.
    Cam is a howards solid flat with 260@.050 intake & 264@.050. .616-.620 lift.
    Automatic with 38-4200 stall,
    I think thats all the info needed???
    I have a #80509 830 classic hp holley now,
    I don't have the budget as of now for a fi system so I'm not worrying about that.
    What do you guys think?
     
  2. RustyRatRod

    RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

    Messages:
    63,408
    Likes Received:
    36086
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    Local Time:
    3:16 AM
    lol

    BIG BO.jpg
     
    • Like Like x 1
    • MOPARMAGA

      MOPARMAGA Well-Known Member

      Messages:
      317
      Likes Received:
      122
      Joined:
      Aug 20, 2019
      Location:
      Seattle Wa
      Local Time:
      12:16 AM
    • yellow rose

      yellow rose Master Of Insanity

      Messages:
      23,908
      Likes Received:
      19917
      Joined:
      Jun 19, 2015
      Location:
      Walking a crooked mile
      Local Time:
      12:16 AM

      If you had the cash for the carb Rusty posted I’d Beal, for that.

      Aside from that, what you have is fine. I’d pin gauge every hole in that thing and write down every hole size.

      I’d start with making sure you have only 2 emulsion holes ~.028-.029 and blank off everything else. Depending on what metering blocks that has, it may have 3 or 4 emulsion holes. If 3, block the middle off with a 6/32 brass set screw. You’ll probably need to to for that. If it has 4 you block 2 and 4 from the top.

      Next up is to add transition slot restictors. I use a brass 8/32 set screw for that and start with about an .080 hole.

      If you don’t have the tools to do it, you can buy them cheap or pay someone to do it.
       
      • Thanks! Thanks! x 1
      • Fisher

        Fisher Old Guy with a Cool car.

        Messages:
        1,951
        Likes Received:
        916
        Joined:
        Jul 22, 2012
        Location:
        Regina Sask Canada
        Local Time:
        2:16 AM
        • Like Like x 3
        • Agree Agree x 2
        • rumblefish360

          rumblefish360 So close, yet so far away FABO Gold Member

          Messages:
          38,739
          Likes Received:
          10340
          Joined:
          Jun 21, 2005
          Location:
          New York, on a Island
          Local Time:
          3:16 AM
          :rofl::rofl::rofl:

          528CBA15-684A-41B2-9D54-206C9F8D50DF.jpeg

          Seriously speaking, it looks and sounds like a great build and a lot of fun. The 830 should do OK for the street but as you figured, leave some on the table at the track.

          I have to ask, what is the balance of the street strip machine?

          I think the track heat is the intake to use and as large as you can get the flow rate of the carb. Being limited to a 4150 bolt pattern is the short coming. For max track effort there is nothing better than the tunnel ram and it’s hard to compete against it. It is a lot of work just going through the hood.

          Staying tuned!
           
          • Like Like x 1
          • yellow rose

            yellow rose Master Of Insanity

            Messages:
            23,908
            Likes Received:
            19917
            Joined:
            Jun 19, 2015
            Location:
            Walking a crooked mile
            Local Time:
            12:16 AM

            Wish I had that intake. Or the Pro Dominator. Should have kept my PD.
             
          • MOPARMAGA

            MOPARMAGA Well-Known Member

            Messages:
            317
            Likes Received:
            122
            Joined:
            Aug 20, 2019
            Location:
            Seattle Wa
            Local Time:
            12:16 AM
            Honestly, I won't know the balance till I drive it the 1st time. I may be so enamored I daily drive it. I'll just need to get a night job to pay to drive during the day lol. But I had in mind street 60-40 race, also I have a couple gear swaps I can do for race day.
            But again it will depend. Right now I live in communist Seattle WA & the roads are garbage. Hopefully moving a few cities away where commonsense exists
             
          • MOPARMAGA

            MOPARMAGA Well-Known Member

            Messages:
            317
            Likes Received:
            122
            Joined:
            Aug 20, 2019
            Location:
            Seattle Wa
            Local Time:
            12:16 AM
            Yeah when I run numbers on calculators I come up with my carb up to 925 cfm.
            I am going to put a 850 base plate on, I think there's a little massaging. Thank you for your reply
             
          • MOPARMAGA

            MOPARMAGA Well-Known Member

            Messages:
            317
            Likes Received:
            122
            Joined:
            Aug 20, 2019
            Location:
            Seattle Wa
            Local Time:
            12:16 AM
            Oh yeah also when I'm confident in my tig welding abilities I plan on making myself a tunnel ram out of 1/8th inch or 3/16 aluminium plate, probably do a 12 inch runner cross ram deal, or a single 4500 flanged 12 inch straight up deal. (ahh the life of a big dreamer....but I usually can make them become reality). Thanks for your reply
             
          • MOPARMAGA

            MOPARMAGA Well-Known Member

            Messages:
            317
            Likes Received:
            122
            Joined:
            Aug 20, 2019
            Location:
            Seattle Wa
            Local Time:
            12:16 AM
            I still don't understand why their called 950s ? Since they don't flow it, but there's gotta something to that 750 main body & 850 baseplate... Air must hustle down the runners
             
          • oldkimmer

            oldkimmer FABO Gold Member FABO Gold Member

            Messages:
            16,174
            Likes Received:
            4692
            Joined:
            Nov 11, 2006
            Location:
            Kindersley, Saskatchewan,
            Local Time:
            2:16 AM
            I have a Pro Systems 1000 4150 series on mine. Kim
             
          • oldkimmer

            oldkimmer FABO Gold Member FABO Gold Member

            Messages:
            16,174
            Likes Received:
            4692
            Joined:
            Nov 11, 2006
            Location:
            Kindersley, Saskatchewan,
            Local Time:
            2:16 AM
            Used to look like this. Kim

            EE99A79F-CD62-4C66-8671-D2A632029192.jpeg

            61AD5B1D-DF77-4545-B53A-76024C696D74.jpeg

            BB9BB3B5-1AF3-4548-869F-5B31830155F8.jpeg
             
            • Like Like x 1
            • Thanks! Thanks! x 1
            • MOPARMAGA

              MOPARMAGA Well-Known Member

              Messages:
              317
              Likes Received:
              122
              Joined:
              Aug 20, 2019
              Location:
              Seattle Wa
              Local Time:
              12:16 AM
              Oh boy, Kim that is something !
              I'm definitely going to make myself a sheet metal dual quad set up someday. Its really difficult to find t-Rams for low decks & there's nothing new coming out so I guess it's home made tribute to the ramchargers
              (Better quality of course)
               
            • AndyF

              AndyF Well-Known Member

              Messages:
              1,743
              Likes Received:
              1827
              Joined:
              Feb 23, 2009
              Location:
              Oregon
              Local Time:
              12:16 AM
              The 80509 carb will work just fine for what you're building. Save your money for something that matters.
               
              • Like Like x 1
              • Fisher

                Fisher Old Guy with a Cool car.

                Messages:
                1,951
                Likes Received:
                916
                Joined:
                Jul 22, 2012
                Location:
                Regina Sask Canada
                Local Time:
                2:16 AM
                I had a Pro systems 950 carb on my BBC , was the biggest pile of crap i ever owned. It went with the car when i sold it. Plus Patrick has no customer service skills. It took me a while to sort out all his mistakes on that carb.
                 
                • Like Like x 1
                • MOPARMAGA

                  MOPARMAGA Well-Known Member

                  Messages:
                  317
                  Likes Received:
                  122
                  Joined:
                  Aug 20, 2019
                  Location:
                  Seattle Wa
                  Local Time:
                  12:16 AM
                  Thanks andy, the carb is good up to 6200 by holleys recommendations, I will be replacing & massaging a 1.75 base plate on, holley guy said throttle response would pick up. if I was looking to get closer to my max rpm of my cam & heads ill need to step up to a 1050 dominator & your right, there's better stuff to buy & there's always time to upgrade
                  (Well that depends on no lunatics in office)
                   
                • MOPARMAGA

                  MOPARMAGA Well-Known Member

                  Messages:
                  317
                  Likes Received:
                  122
                  Joined:
                  Aug 20, 2019
                  Location:
                  Seattle Wa
                  Local Time:
                  12:16 AM
                  That's basically a 750 with an 850 baseplate if I'm not mistaken. Way overpriced, thanks for letting me know that.
                  I think I'm just going to put a billet 850 baseplate on my 830hp.
                   
                • mopowers

                  mopowers Well-Known Member

                  Messages:
                  4,842
                  Likes Received:
                  1938
                  Joined:
                  Feb 15, 2006
                  Location:
                  West Sacramento, CA
                  Local Time:
                  12:16 AM
                  What's wrong with the baseplate on the one you've got?
                   
                • MOPARMAGA

                  MOPARMAGA Well-Known Member

                  Messages:
                  317
                  Likes Received:
                  122
                  Joined:
                  Aug 20, 2019
                  Location:
                  Seattle Wa
                  Local Time:
                  12:16 AM
                  Nothing's wrong with it, just that it's nearly a the same venturi as throttle bore. It basically turns it into an 850
                   
                • mopowers

                  mopowers Well-Known Member

                  Messages:
                  4,842
                  Likes Received:
                  1938
                  Joined:
                  Feb 15, 2006
                  Location:
                  West Sacramento, CA
                  Local Time:
                  12:16 AM
                  Can you run a baseplate with 1-3/4 throttle blades on a carb body with 1-11/16 throttle bores?
                   
                • MOPARMAGA

                  MOPARMAGA Well-Known Member

                  Messages:
                  317
                  Likes Received:
                  122
                  Joined:
                  Aug 20, 2019
                  Location:
                  Seattle Wa
                  Local Time:
                  12:16 AM
                  Yes, it takes a little massaging, or a spacer between the body & the bore
                   
                  • Thanks! Thanks! x 1
                  1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                    By continuing to use this site, you are consenting to our use of cookies.