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    Block Off Plugs  Big and Ugly BAU Butterfly Block

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      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"

      $175.00

       
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      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/