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

Please CLICK HERE for ATK Core Return Process

NOTE:

• Core return can be any Small Block Ford 351W engine

Block Information:

• Seasoned OE non roller block 1988-1993
• Bore/Stroke: 4.040" x 3.500"
• Displacement: 351W
• Camshaft Bearings: Dura-Bond, installed and clocked to OEM position
• Freeze Plugs: Brass, installed and sealed
• Oil Galley Plugs: Installed and sealed

Rotating Assembly:

• Crankshaft: OE 1 piece seal cast crank
• Balance: External 28oz (flexplate/flywheel/balancer)
• Rods: OE powder metal 5.955"
• Compression Ratio: 58cc= 9.4:1 / 64cc= 8.7:1 / 70cc= 8.2:1
• Pistons: Hypereutectic D cup dish
• Rings: Plasmamoly

Recommended Components:

• Balancer: External balance 28oz
• Flexplate/Flywheel: External balance 28oz
• Head Gasket: .047" thickness or per application
• Oil: 10W30 Non syntheitc for first 3000 miles
• Oil Filter: Wix or K&N per application

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.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

Please CLICK HERE for ATK Warranty