309 Master Cylinder

[turbojet427]

What is a "GA" coded 309 master cylinder for?

[Mr70]

Those were used on 1969 Firebirds w/power front disc brakes & rear drum.
Master cylinder casting #5468309,actual factory part #5469357
Coded GA
Primary piston has shallow push rod hole
Secondary piston identification has 3 rings
Bore diameter is 1.125"
Distribution 69/31
Port location/routing front-front/rear-rear
Port sizes front 1/2"x20,rear 9/16"x18
Line wrench size front and rear 9/16"

[turbojet427]

Thanks!!

[wheelhop]

Rick,
I think you need to get out more!!

[Unreal]

Hey Rick,
I have this crick in my back.......