The March 1968 edition of Autolite Shop Tips includes a comprehensive description of the modifications made to prepare the 1968 428 Cobra Jet engine for drag strip duty in the Stock and Super Stock classes. Here's a summary (part numbers are service part numbers unless noted as engineering part numbers):
Component | Production | "C" Stock | "E" Super Stock |
---|---|---|---|
Cylinder Head | C8OZ-6049-F Engineering Number C8AE-6090-J |
Same | Same |
Intake Manifold (Aluminum) |
C6AZ-9424-H Engineering Number C7AE-9425-F |
Same | Offset 427 C6AZ-9424-M Engineering Number C7AE-9425-C |
Intake Manifold (Cast Iron) |
C8OA-9424-A Engineering Number C8OE-9425-A |
Same | N/A |
Carburetor, Manual (735 cfm) |
C8OZ-9510-AA | Same | Same |
Carburetor, Automatic (735 cfm) |
C8OZ-9510-AB | Same | Same |
Camshaft | Hydraulic C6OZ-6250-B |
Hydraulic C8AX-6250-C |
Solid C8AX-6250-D |
Valve Spring | Not Specified | 427 Type C5AZ-6513-A |
Crane or H-M Type spring, retainer, push rod, and tappet |
Rocker Arm | Non-Adjustable 1.73:1 B8AZ-6564-C Adjustable 1.76:1 B8A-6564-B |
Adjustable 1.76:1 B8A-6564-B |
Adjustable 1.76:1 B8A-6564-B |
Exhaust Valve | C3AZ-6505-E | Same | Lightweight, Sodium-Filled C8AX-6505-B |
Intake Valve | C3AZ-6507-AJ | Same | Lightweight, Hollow Stem C8AX-6507-B |
Valve Lifter | Hydraulic Part Number C3DZ-6500-B |
Hydraulic Part Number C4TZ-6500-A |
Crane Lightweight or 427 Type C4AZ-6500-B |
Piston (Cast Aluminum) |
C6AZ-6108-AY, 10.7:1 CR | Forged, Dished/Eyebrows 11.0:1 CR |
Forged, Flat top/Eyebrows 11.6:1 CR |
Piston Rings | C6AZ-6148-A | Moly Type | Moly Type |
Piston Rods | P.I. Type C6AE-6200-F 427 Type C5AZ-6200-D |
427 Type C5AZ-6200-D |
427 Type C5AZ-6200-D |
Crankshaft | C6AZ-6303-B1 | Same | Same |
Oil Pan | C6OZ-6675-A | Deep sump 9-quart C5AE-6675-N |
Same |
Oil Pickup | C6OZ-6622-A | C5AE-6622-C | Same |
Oil Filter | C1AZ-6731-A | Low Resistance C8AE-6714-B |
Same |
Distributor | C8OZ-12127-D | Dual point, 427 Type C5AZ-12127-E |
Same |
Exhaust System | Not Specified | Jardine or Doug's Type headers | Same |
Vibration Damper | Not Specified | Heavy Duty 427 Type | Same |
Clutch | Not Specified | Production Auto. and Manual | Heavy Duty #2650 Type |
Transmission | 2.32, 1.69, 1.29 ratios | Production/blocker rings cut Line lock |
Same |
Rear End | 3.89:1, no locker | 4.44:1/242L Detroit Locker | 4.71:1/242L Detroit Locker |
Suspension | Not Specified | 32" traction bar right side Single link bar left side |
32" traction bar both sides |
Shocks | Not Specified | Heavy Duty Type | Same |
Tires | F70 Firestone | 8.90x14, 7" Tread | 10.50x15 |
Shipping weight: AMA's Mustang fastback 3267 lbs., hardtop 3243 lbs.