This small block with big cubic inches makes for a great foundation for aggressive street or race builds.

Block Information:

• Dart SHP 4 bolt main, 2-piece rear main seal
• Bore/Stroke: 4.125" x 4.000"
• Displacement: 427ci
• 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 4340 Forged
• Balance: Internally balanced (front+rear)
• Rods: Scat 6.00" 4340 forged H beam with 8740 ARP bolts 
• Compression Ratio: 58cc= 12.6:1 64cc= 11.7:1 / 70cc= 11.0:1 
• Pistons: Forged flat top -6.9cc
• Rings: Plasmamoly

  Recommended Components:

• Balancer: Internal balance
• Flexplate/Flywheel: Internal balance (Pre 1985 2-piece rear main engine)
• Head Gasket: .038" thickness or per application
• Oil: 10W30 Non synthetic for first 3000 miles
• Oil Filter: Wix or K&N per application
• Requires a reduced base circle camshaft

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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Please CLICK HERE for ATK Warranty