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 Chevy 350ci engine, except 1992-1997 LT1 style engines

Bullet proof bottom end built to handle more power with its top of the line parts. 

Block Information:

• Seasoned OE 4 bolt main 1pc seal 1996-2000 roller block, passenger side dipstick
• Bore/Stroke: 4.040" x 3.750"
• Displacement: 383ci
• 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: Scat nodular iron
• Balance: External rear (flexplate/flywheel), internal front (haromonic balancer)
• Rods: Scat 5.70" 4340 forged I beam with 8740 ARP bolts 
• Compression Ratio: 58cc= 12.1:1 64cc= 11.2:1 / 70cc= 10.5:1 
• Pistons: Forged flat top -3.7cc
• Rings: Plasmamoly

  Recommended Components:

• Balancer: Internal balance
• Flexplate/Flywheel: External balance (1987-Up 1 piece rear main)
• Head Gasket: .038" thickness or per application
• Oil: 10W30 Non synthetic for first 3000 miles
• Oil Filter: Wix or K&N per application

Please CLICK HERE for ATK Warranty