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 applicationEngine 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
Highlights
- 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
Specifications
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Crate Engine Type: Short Block
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Camshaft Type: Hydraulic Roller
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Carburetor Included: No
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Intake Manifold Included: No
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Distributor Included: No
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Valve Covers Included: No
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Engine Balance: Internal
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Cylinder Heads Included: No
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Rear Main Seal Style: 1-piece
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Throttle Body Included: No
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Oil Pan Included: No
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Timing Cover Included: No
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Water Pump Included: No
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Harmonic Balancer Included: No
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Flexplate Included: No
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Flywheel Included: No
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Air Cleaner Included: No
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Spark Plugs Included: No
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Spark Plug Wires Included: No
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Computer Included: No
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Wiring Harness Included: No
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MFG. Part #: SP15NB
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Brand: ATK Engines
