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Product details
Three hat-retention points and a 1.370-inch N reference identify this GM G-Body front hub. The hub is part of a complete hat-mounted brake conversion, requiring the matching spindle, bearings and rotor position. Founded by Bill Wood in 1977, Wilwood Engineering designs and manufactures disc brake systems from Camarillo, California. Its calipers, brake rotors, master cylinders, valves, fittings and brake lines serve motorsport, street-performance and specialized applications. Individual components must be selected for the complete brake system.
Technical Details
- Manufacturer part number: 270-12304
- Component: Hub - Hat Mount
- Position in the specified assembly: Front
- Material: Aluminum
- Finish: Bare
- Wheel mounting pattern(s): 5 x 4.50, 5 x 4.75 inches; separate from rotor or drive-flange attachment
- Wheel-stud thread: 1/2-20
- Rotor mounting arrangement: Hat
- Product-page drawing references (inches): D = 2.495; H = 2.000; M = 3.150; N = 1.370; P = 3.010; Q = 0.250. Use the manufacturer drawing for the reference faces.
- Manufacturer bearing / race references: Inner Bearing: 370-0879; Outer Bearing: 370-0933; Inner Hub Bearing - Race: 370-0878; Outer Hub Bearing - Race: 370-0881. References identify compatible service parts and do not mean all bearings are included.
- Package: One hub; the compatible rotor, rotor adapter or hat and its attachment hardware are selected for the complete conversion
- Hat retention: Three 1/4-20 holes; Wilwood lists bolt kit 230-7032
- Hub closure and races: Manufacturer describes included bearing races and screw-on aluminum cap; confirm the supplied assembly and obtain the compatible bearings separately
Fitment & Compatibility
Use the exact conversion instructions to compare the spindle and hub dimensions. Confirm the bearing seats, rotor mounting arrangement and wheel-stud engagement before assembling the replacement.
Wilwood component specifications · Manufacturer reference DS719
Ask PMB Performance for help comparing the installation requirements. We have more than 20 years of experience working with brake parts and fitment.
