Brand: Optimum Balance Products (OBP)
These master cylinders have been designed by OBP as a less-expensive alternative to the Girling brand. The outet port faces the rear of the car, which is ideal for cars with limited space in front of the master cylinder. All sizes come complete with a pushrod. The lengths of the pushrods vary but are usually 3.75 to 4.00" long as measured from the mounting flange.
- Outlet Port Thread: 3/8-24 (3AN)
- Inlet Port Thread: 7/16-20 (4AN)
- Pushrod Thread: 5/16-24
- Cylinder Length (measured from mounting face): 4.2"
- Mounting Hole Spacing: 2 1/4" (vertical)
- Stroke: 1.375"
Note: These are not genuine Girling units. They are very high-quality reproductions, made in the UK as an alternative to the (increasingly expensive) original. All dimensions and threads are the same as on the Girling.
Reservoirs and Inlet Fittings:
Large Reservoir with Centered 7/16-20 Threaded Outlet (Part No. 3574)
Medium Reservoir with Offset 7/16-20 Threaded Outlet (Part No. 3569)
7/16-20 to 5/16" Hose Barb Inlet Fitting (Part No. 3207)
7/16-20 Banjo to 5/16" Hose Barb Low-Profile Inlet Fitting (Part No. 3219)
5/16" ID Remote Reservoir Hose (Part No. 3575)