Thumbnail Filmstrip of Block off plugs Big and Ugly BAU Butterfly Block O Images
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 .
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.
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 in 3-11/16", 4-3/8" (BAU3), and 5-9/16" (BAU1)