ATK SP15NB 100% New Chevy 377CI Stroker Short Block -18cc Dish Piston 1pc Seal



Lead Time: In stock ready to ship



Engine Specifications:
• Block: 100% New American Made Block 1pc Seal with upgraded heavy duty 2 bolt main caps (this is not your typical GM 2 bolt main block)
• Bore/Stroke: 4.000” x 3.750”
• Displacement: 377CI
• Crankshaft: Scat nodular iron external balance rear of the crank/internal balance front of the crank
• Rods: Scat 4340 forged I beam with ARP 8740 bolts
• Pistons: Hypereutectic -18cc dished
• Compression Ratios: 58cc = 10.3:1 / 64cc = 9.7:1 / 70cc=9.1:1 (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: 10W30 Non synthetic for first 3000 miles
• 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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