ATK SP53NB 100% New CHEVY 377CI Stroker Forged -5cc Flat Top Pistons



Lead Time: Estimated: 4 - 6 weeks



Looking to upgrade your old engine using your existing heads? This Short Block uses a 100% New American Made Block and is outfitted with a Scat crank kit. All the hard work is done, you just need to finish it off.

Engine Specifications:

• Block: 100% New ATK Block 1pc Seal
• Bore/Stroke: 4.000” x 3.750”
• Displacement: 377CI
• Crankshaft: Scat 4340 forged external balance rear of the crank/internal balance front of the crank
• Rods: Scat 4340 forged H beam with ARP 8740 bolts
• Pistons: 2618 Forged -5cc flat top
• Compression Ratios: 58cc = 11.9:1 / 64cc = 11.1:1 / 70cc = 10.3:1 (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
• Flexplate/Flywheel: External balance 168 tooth (with Scat kit)


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

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


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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