ATK SP41-1P Chevy 489/496CI Stroker Short Block +20cc Dome Pistons 1pc Seal



Lead Time: Estimated: 4 - 6 weeks


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  • $410 Core charge - $410.00
SKU: SP41-1P Categories: , ,


Engine Specifications:
• Block: OE seasoned 454 block 4 bolt main 1pc seal 1991-1995 Gen V
• Bore/Stroke: up to 4.310” x 4.200”
• Displacement: 489/496
• Crankshaft: Scat 4340 forged 4.250” stroke internally balanced 1pc seal
• Rods: Scat 4340 forged H beam 6.385” with ARP 8740 bolts
• Pistons: Forged +20cc dome
• Compression Ratios: 112cc = 10.9:1 / 118cc = 10.4:1 / 124cc = 9.9:1 (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

Recommended Components:
• Balancer: Internal balance
• Flexplate/Flywheel: 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

• No mechanical fuel pump provisions


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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