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 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.

Highlights

• Oil: Conventional / Non Synthetic 10W30
• Oil Filter: Wix or K&N
• Timing: Set to factory specifications via PCM module (ECM TUNING REQUIRED).

Specifications

• Crate Engine Type: Short Block
• Engine Displacement: 6.2 liters
• Camshaft Type: Hydraulic Roller
• Piston Material: Forged Aluminum
• Crankshaft Material: Forged 4340 Steel
• Camshaft Duration (.050 in): 225° intake / 238° exhaust
• Camshaft Lift (in): .612 intake / .585 exhaust
• Bore x Stroke (in): 4.060" x 3.620"
• Carburetor Included: No
• Intake Manifold Included: No
• Distributor Included: No
• Connecting Rod Material: Forged 4340 Steel
• Valve Covers Included: No
• Assembled: No
• Engine Balance: Internal
• Cylinder Heads Included: No
• Rear Main Seal Style: 1-piece
• Throttle Body Included: No
• Oil Pan Included: No
• Timing Cover Included: No
• Water Pump Included: No
• Harmonic Balancer Included: No
• Flexplate Included: No
• Flywheel Included: No
• Air Cleaner Included: No
• Spark Plugs Included: No
• Spark Plug Wires Included: No
• Computer Included: No
• Wiring Harness Included: No
• Material Type: Cast Iron
• MFG. Part #: SP53NB
• GTIN Code: 00653517679018
• Sold in Quantity: Each
• Connecting Rod Beam Style: H-Beam
• Piston Style: Flat Top
• Brand: ATK Engines

Emissions Notice

Emissions warning: this part is for vehicle engine changes, not direct oem engine replacements. In California, engine changes are legal when done in compliance with California bureau of automotive repairs (bar) engine change policy. For assistance, call bar referee at: (800) 622-7733. And see https://bar.Ca.Gov/consumer/smog_check_program/engine_changes. All customers must comply with federal epa mobile source enforcement memorandum no. 1a (and addendum) and all applicable state regulations when conducting engine changes. Improper installation and/or use of this part in California may subject the installer and/or owner to a $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and laws of all states for use of this engine change part on makes or models of vehicles that render them noncompliant with applicable state and/or federal emission laws with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine