ATK SP48 Chevy 427CI Short Block Flat Top Pistons



Lead Time: ETA 2-3 weeks

SKU: SP48 Categories: , ,


Engine Specifications:
• Block: Dart SHP 4 bolt main 2pc rear main seal
• Bore/Stroke: 4.125” x 4.000”
• Displacement: 427CI
• Crankshaft: Scat 4340 forged internally balanced
• Rods: Scat 4340 forged H beam with ARP 8740 bolts
• Pistons: 2618 Forged -6.9cc flat top
• Compression Ratios: 58cc = 12.6:1 / 64cc = 11.7:1 / 70cc = 11.0:1 (can vary due to deck height/gasket thickness)
• Rings: Plasmamoly
• Camshaft Bearings: Dura-Bond, installed and clocked to OEM position
• Freeze Plugs: Brass, installed and sealed
• Oil Galley Plugs: Installed and sealed

Recommended Components:
• Balancer: Internal balance
• Flexplate/Flywheel: Internal balance
• Head Gasket: .038” or per application

Engine Info:
• Oil: 10W30 Conventional / Non Synthetic for first 3000 miles
• Oil Filter: Wix or K&N per application

Notes: Requires a reduced base circle camshaft.


Disclaimer: The recommended components listed are ATK’s recommendations of parts to be used, applications vary and your build may need something different. Contact ATK for a recommendation if you’re not certain about a component to use. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.


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