Mid Dress Engine
ATK Core Return Process
JEGS and ATK appreciate your business and want to ensure that your core return is as smooth as possible.
- Core return can be any Small Block Ford 302ci engine
- Balancer: External 50oz
- Distributor: Pro Billet MSD #121-83521 (steel gear)
- Exhaust: 1-5/8" Headers
- Firing Order: 13726548
- Flexplate: External 50oz
- Intake Manifold: Edelbrock Performer RPM dual plane #350-7121
- Octane: 91+
- Oil: 10W30 (Conventional / Non Synthetic)
- Oil Filter: Wix or K&N
- Spark Plug Gap: .035"
- Stall Converter: 2400-2800
- Timing: 34-36 Degrees (Vacuum port plugged on carburetor)
- Water Pump: RH - standard rotation
- Carburetor: Quick Fuel 680cfm #793-HR-680-VS (vacuum secondary's, electric choke)
- Fuel Pump: Holley Mechanical 110gph #510-12-289-11
- Spark Plugs: Autolite #417-3923
- Spark Plug Wires: 8mm
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.
In 2007, ATK launched a High Performance Division with one of the finest engine shops in the country. By reverse engineering all of their engines, they are able to eliminate any OEM deficiencies. This makes an ATK built crate engine have a superior design over the original engine by incorporating better components when needed. These quality built engines are offered in three different stages for ease of finishing an engine swap. ATK HP engines feature a 24 month/unlimited mile warranty.
This engine was designed to be streetable, with a noticeably idle and works with power accessories.
- Horsepower: 375 hp
- Torque: 380 lb/ft
- Seasoned OE roller block 1987-1995
- Bore/Stroke: 4.040" x 3.000"
- Displacement: 302ci
- Crankshaft: OE cast 1 piece seal
- Balance: 50oz external balance
- Rods: OE steel rod 5.400" stock bolts
- Compression Ratio: 9.5:1
- Pistons: Hypereutectic
- Rings: Moly
- Camshaft: Hydraulic roller
- Cam Duration @ .050": Intake 220 / Exhaust 224
- Cam Lift: Intake .512" / Exhaust .512"
- Lobe Separation Angle: 112lsa
- Timing Chain: Double roller
Cylinder Head Information:
- Cylinder Heads: Dart Pro 1 aluminum
- Combustion Chamber: 58cc
- Intake Runner: 170cc
- Valve Size: 2.02" Intake / 1.60" Exhaust
- Rocker Arms: Aluminum 1.6 roller
Oil Pan Information:
- Oil Pan: Dual sump (Fox Body) or Front Sump
- Oil Pump: Melling high volume
- Short Block
- Timing Set
- Cylinder Heads
- Valve Covers
- Timing Cover
- Oil Pan
- Oil Pump & Pickup Tube
Mid Dress Engines
- Consists of Base Engine Build
- Intake Manifold
- Water Pump
- Harmonic Balancer
- Consists of Mid Dress Engine Build
- Fuel Pump
- Carburetor or EFI
- Spark Plug Wires
- Spark Plugs
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.