Carb secondaries
- 78TransAm
- 12/11/2012
- Vehicle Pontiac Firebird Trans Am WS6
- Category Engine Modifications
- Last Updated 12/11/2012
- Comments The original sd455 carb has a tab on the passenger side of the upper secondary shaft that only allows the top butterflies to open about 15 degrees. With this tab removed the secondaries open to the proper nearly vertical position. I am certain that this i