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 Big Block Ford 460ci engine

Engine Specifications

This was designed to be a powerhouse, so expect aggressive idle, massive power, and no vacuum for power brakes.

• Horsepower: 545 hp
• Torque: 595 lb/ft

Block Information:

• Seasoned OE block
• Bore/Stroke: 4.400" x 4.150"
• Displacement: 502ci

Rotating Assembly:

• Crankshaft: Scat nodular iron
• Balance: Internal balance
• Rods: Scat 4340 forged I beam with ARP 8740 bolts
• Compression Ratio: 9.5:1
• Pistons: Hyperuetectic
• Rings: Moly

Camshaft Specs:

• Camshaft: Hydraulic flat tappet
• Cam Duration @ .050": Intake 253 / Exhaust 253
• Cam Lift: Intake .585" / Exhaust .585"
• Lobe Separation Angle: 110lsa
• Timing Chain: Double roller

Cylinder Head Information:

• Cylinder Heads: Edelbrock Performer RPM aluminum
• Combustion Chamber: 75cc
• Intake Runner: 292cc
• Valve Size: 2.190" Intake / 1.760" Exhaust
• Rocker Arms: Stainless steel 1.73 ratio

Oil Pan Information:

• Oil Pan: Front sump 
• Oil Pump: Melling high volume

Recommended Components

• Balancer: Internal
• Carburetor: Quick Fuel 780cfm #793-HR-780-VS (vacuum secondary's, electric choke)
• Distributor: Pro-Billet MSD #121-8350 (iron gear)
• Intake Manifold: Edelbrock Performer RPM dual-plane #350-7166
• Flexplate/Flywheel: Internal
• Automatic Transmission Stall Converter: 3500+
• Fuel Pump: Holley Mechanical 110gph #510-12-460-11 
• Spark Plugs: Autolite #417-3923
• Spark Plug Wires: 8mm
• Water Pump: OE

Disclaimer: The parts listed are ATK's recommendations of parts to be used to obtain the power figures listed. Power figures can vary based on parts used by the end-user. Some modifications to the vehicle may be required using these and or other aftermarket parts.

Engine Break-In Procedure

Use or 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 RPMs, 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 to 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 RPMs (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 additives, until about 4,000 miles. At that point, you may run a quality 10w30 synthetic oil if you choose. Use of 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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