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

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 and 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