ATK Core Return Process
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NOTE:

• Core return can be any Small Block Ford 302ci engine

Engine Specifications

A classic 302 Ford engine with stock idle, built to replace a stock worn out 302. This Engine is based on the 1980-1986 Ford 302.

• Horsepower: 240 hp
• Torque: 325 lb/ft

Block Information:

• Seasoned OE non roller block 
• Bore/Stroke: 4.060" x 3.000"
• Displacement: 302ci

Rotating Assembly:

• Crankshaft: OE cast 1 piece seal
• Balance: 50oz external balance
• Rods: OE powder metal rod 5.090" stock bolts
• Compression Ratio: 8.6:1
• Pistons: Hypereutectic
• Rings: Moly

Camshaft Specs:

• Camshaft: Hydraulic flat tappet
• Cam Duration @ .050": Intake 192 / Exhaust 183
• Cam Lift: Intake .380" / Exhaust .395"
• Lobe Separation Angle: 111lsa
• Timing Chain: Double roller

Cylinder Head Information:

• Cylinder Heads: OE E5TE/E7TE cast iron
• Combustion Chamber: 62cc
• Valve Size: 1.77" Intake / 1.46" Exhaust
• Rocker Arms: Stamped steel 1.6 ratio pedestal mount

Oil Pan Information:

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

Engine Info

• Balancer: External 50oz
• Carburetor: Holley Street Avenger 600 cfm #510-0-80457SA
• Distributor: HEI (iron gear) (may not clear OE air cleaners/monte carlo bar)
• Firing Order: 15426378
• Flexplate: 164 tooth 50oz External Balance
• Fuel Pump: Mechanical 80gph
• Intake Manifold: Weiand dual plane #925-8124WND
• Octane: 91+
• Spark Plugs: Autolite #417-24
• Spark Plug Gap: .035"
• Spark Plug Wires: 8mm
• Timing: 34-36 Degrees (Vacuum port plugged on carburetor)
• Water Pump: RH inlet - standard rotation

Notes: This engine does not have a manual transmission boss for the clutch.

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 RPM's, with no-load on the engine for the first 30 minutes. Let the engine cool down completely and repeat process 2-3 more times. Do not idle the engine for any extended period at this time, this is critical to break 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. 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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