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

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NOTE:

• Core return can be any 1971-2003 Small Block Chrysler 360ci engine

Engine Specifications

This JEGS crate engine has a stock idle, produces a great vacuum, and provides plenty of power for cruising streets.

• Horsepower: 310 hp
• Torque: 400 ft.-lbs.

Block Information:

• Seasoned OE 2 Magnum roller block 1993-2001
• Bore/Stroke: 4.060 in, x 3.580 in.
• Displacement: 360 ci

Rotating Assembly:

• Crankshaft: OE cast
• Balance: External front, internal rear
• Rods: OE 6.123 in.
• Compression Ratio: 9.1:1
• Pistons: Hypereutectic
• Rings: Moly

Camshaft Specs:

• Camshaft: Hydraulic roller
• Advertised Cam Duration: 251 Intake; 271 Exhaust
• Cam Duration @ .050 in.: 188 Intake; 194 Exhaust
• Cam Lift: .411 in. Intake; .418 in Exhaust
• Intake Centerline: 116 Degrees
• Timing Chain: HD single roller
• Includes fuel pump eccentric to run a mechanical fuel pump

Cylinder Head Information:

• Cylinder Heads: OE Magnum cast iron
• Combustion Chamber: 65 cc
• Valve Size: 1.780 in. Intake / 1.500 in. Exhaust
• Rocker Arms: Steel 1.6 pedestal rockers

Oil Pan Information:

• Oil Pan: OE front sump 5 qt.
• Oil Pump: Melling standard volume

Note: 

• Valve Covers Required (Not included)
• Magnum timing cover

Engine Break-In Procedure

Use break-in oil or conventional (non-synthetic) 10w30 oil with zinc additive for the first 500 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. It is best to avoid long periods of idling during this period. Check the engine oil and coolant levels daily. 

Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPM's, with no-load on the engine for the first 30 minutes. Let the engine cool down completely and repeat the process 2-3 more times. Do not idle the engine for an extended period at this time, this is critical for breaking in the camshaft.

At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil with a zinc additive. Check fuel and ignition settings, adjust valves (where applicable).  Drive the next 500 miles normally, without high RPM's (below 5000 RPM), hard use, or extended periods of high loading or long periods of idling.

Change the oil and oil filter again at 1,000 miles. Continue using conventional (non-synthetic) oils and zinc additive, until about 4,000 miles. At that point, you may run a quality 10w30 synthetic oil if you choose. Using an oil with zinc or a zinc additive for the life of your engine is recommended. 

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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