1967 Ford 428 Cobra Jet Program Memo - Special 50 Car Build Requirements

This is a scanned Ford internal memorandum dated 12/1/67 titled "Requirements for Special (50) Car Build — Cobra Jet Program." It lists the build specifications for a special run of 50 428 Cobra Jet cars. The engine is specified as the 428 Cobra Jet, but using existing 390 exhaust manifolds. The clutch is a Police Interceptor setup with specific Ford part numbers for the clutch disc (C5AA7550-K), pressure plate (C3AA7563-C), hub and bearing (C6AA7548-D), housing (C60A-6392-D), and clutch fork (C7OA7541-A). The transmission is a heavy-duty four-speed with 1-3/8" 10-spline input shaft, 31-tooth spline output shaft, and 2.32 low gear ratio. The rear axle is a 3.89:1 Daytona-type torque-sensitive locker, with 3.89:1 or 3.50:1 non-locker substitutes allowed. Other specifications include a GPD prototype ram air cleaner with hot and cold stove, a modified C7ZZ-16612-A hood accepting an air scoop, a prototype ram air hood scoop, manual drum brakes, the 390 GT Mustang A/C cooling package, suspension the same as the Mustang 427-S, Wimbledon White exterior with black vinyl interior, memo billing under H.O.R. 84000, and deletion of all sealer and deadener on twenty units per DSO-89-2017. Purchasing contact is Mr. A. A. Turner, Stock Vehicles Department (30686).