ATK Engines Remanufactured Crate Engine for 1973-1991 Chevy/GMC C/K Truck, SUV, Car, & Van with 454ci V8

Notes:

• VIN N, S, W, Y, Z
• Head Cast #: 045, 236, 290, 360 (check head cast # – intake ports differ)
• Block Cast #: 959, 445, 286, 289, 321, 293
• 2 piece rear main seal
• 2 bolt mains

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.