ATK Core Return Process
JEGS and ATK appreciate your business and want to ensure that your core return is as smooth as possible.

Please CLICK HERE for ATK Core Return Process

Notes:

• VIN: A, C, D, K, N
• Head Cast #: C5AE-E, C6AE-G, C70E-D, C8
• Block Cast #: C5AE, C50E, C6AE
• 6 bolt bellhousing (Check for 1965, if 5 bolt use #059-DF71)

Engine Break-In Procedure

Use conventional or break-in oil (non-synthetic) for the first 600 miles of operation. Do not drive for long periods at any single speed, always vary your speed. Do not tow a trailer or put other heavy loads on the vehicle. Check the engine oil and coolant levels daily. 

At 600 Miles change the engine oil and filter using conventional (non-synthetic) oil. Check fuel and ignition settings; adjust valves (where applicable).

After the first 5,000 of service synthetic engine oil may be used. Follow your vehicle owner’s manual for service intervals.

Please CLICK HERE for ATK Warranty