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Billet Block off that pushes in the top with an o ring to seal it and Causes the footprint to be reduced to 2-3/8" fits 4 Port Hilborn or Alkydigger Billet 4 port butterfly
Removable-
When using original Hilborn Scoop- you will have to trim the block off or scoop to clear
with our new scoop- it fits with no machining