{"product_id":"wilwood-270-12304","title":"Wilwood Front Hat Hub for GM G-Body (1980–1987), Dual 4.50\/4.75-Inch Wheel Patterns","description":"\u003cp\u003eThree 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.\u003c\/p\u003e\u003ch3\u003eTechnical Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer part number:\u003c\/strong\u003e 270-12304\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent:\u003c\/strong\u003e Hub - Hat Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition in the specified assembly:\u003c\/strong\u003e Front\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Bare\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWheel mounting pattern(s):\u003c\/strong\u003e 5 x 4.50, 5 x 4.75 inches; separate from rotor or drive-flange attachment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWheel-stud thread:\u003c\/strong\u003e 1\/2-20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotor mounting arrangement:\u003c\/strong\u003e Hat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct-page drawing references (inches):\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer bearing \/ race references:\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage:\u003c\/strong\u003e One hub; the compatible rotor, rotor adapter or hat and its attachment hardware are selected for the complete conversion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHat retention:\u003c\/strong\u003e Three 1\/4-20 holes; Wilwood lists bolt kit 230-7032\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHub closure and races:\u003c\/strong\u003e Manufacturer describes included bearing races and screw-on aluminum cap; confirm the supplied assembly and obtain the compatible bearings separately\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e\u003cp\u003eUse 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.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.wilwood.com\/Hubs\/HubProd?itemno=270-12304\"\u003eWilwood component specifications\u003c\/a\u003e · \u003ca href=\"https:\/\/www.wilwood.com\/PDF\/DataSheets\/ds719.pdf\"\u003eManufacturer reference DS719\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003eAsk PMB Performance for help comparing the installation requirements. We have more than 20 years of experience working with brake parts and fitment.\u003c\/p\u003e","brand":"Wilwood","offers":[{"title":"Default Title","offer_id":67731116785842,"sku":"270-12304","price":173.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0521\/8792\/2610\/files\/Big_Brake-xl_ff5b3edf-565f-465b-a5ab-44099cb9cf63.jpg?v=1792184340","url":"https:\/\/pmbperformance.com\/products\/wilwood-270-12304","provider":"PMB Performance","version":"1.0","type":"link"}