New Product Lines- Moroso & Engler Fuel Injection coming Soon- HILBORN Parts in Stock-The Blower Shop's Largest Dealer-RCD Engineering -APD Carbs largest Stocking Dealer
Product Search

    Secure Checkout
    Block Off Plugs  Big and Ugly BAU Butterfly Block

    Thumbnail Filmstrip of Block Off Plugs Big and Ugly BAU Butterfly Block Images

      Purchase Block Off Plugs Big and Ugly BAU Butterfly Block

      SKU: JB-556
      Block Off Plugs Big and Ugly BAU Butterfly Block Off Plates 5-9/16"

      $180.00

       



      If you are flowing too much air and want to re balance your system down to suit your engine size  this is for you .  These work great on Mechanical, but for EFI we recommend retro fitting the Progressive linkage .

      When using a 5-9/16" on a lesser engine you can use 1 of these or two  for mechanical injection on engines under 550 cu in or with light blower boost. 

      Our BAU injector blanks are inserted from behind the butterfly and secure with a bolt and sealer.  5 minute job if the injector is not on the blower

      Installs quickly.

      For engines not requiring so much air flow, blanking off 1 or 2 butterflies and using a filter in the operating butterfly, helps throttle control.

      You can use as many as you wish.

      When the butterflies are closed they are not visible.

      Also available in3-11/16", 4-3/8" (BAU3), 5"(BAU2)

      https://www.permatex.com/products/gasketing/gasket-sealants/permatex-permashield-fuel-resistant-gasket-dressing-flange-sealant/