ATK Chevy 489/496 Stroker Short Block +20cc Dome SP98 Engine

Item #22545

Made in the USA
ATK Chevy 489/496 Stroker Short Block +20cc Dome SP98 Engine
ATK SP98 Chevy 489/496 Stroker Short Block +20cc
* ** THIS ITEM IS TEMPORARILY OUT OF STOCK *** FREE SHIPPING on ATK Engines. This item ships directly from the manufacturer and is not available for store pickup. Some engines are made-to-order or can be backordered. Delivery can be delayed up to 5 to 6 weeks but typically ship within 2 weeks.
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Create your race or street engine with this ATK SP98 Chevy 489/496 Stroker Short Block. It is assembled with Scat crankshaft and connecting rods to offer rock-solid bottom end to your build. Freeze plugs and oil galley plugs are installed and sealed for reduced hassle.

Engine Specifications:

  • Block: OE Block 1991-1995 Gen V 4 Bolt 1pc Seal (No Mechanical Fuel Pump Provisions)
  • Bore/Stroke:up to 4.310 x 4.250
  • Displacement: 489/496 C.I.D.
  • Crankshaft: Scat Nodular Iron 4.250" Stroke Internally Balanced 1pc.
  • Connecting Rods: Scat 4340 Forged I Beam 6.385" ARP 8740 Bolts
  • Pistons: Forged +20cc Dome
  • Piston Rings: Moly Rings
  • Compression Ratio: 118cc=10.2:1/124cc=9.7:1
  • Camshaft Bearings: Installed & Clocked to OEM Position
  • Freeze Plugs: Brass Installed & Sealed
  • Oil Galley Plugs: Installed & Sealed
  • Weight:360

Every great build needs a solid foundation! For that reason, we take the hard work out of the picture by selling short blocks that are ready for you to complete yourself. Our GM Short Blocks are most commonly packaged as the engine block assembled with Pistons, Piston Rings and Crankshaft installed.

ATK specializes in muscle. With the highest quality internal parts and Dyno Proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty.

Don't forget the engine paint!
Engine Paint


ATK High Performance Chevy 489/496 CI Stroker Short Blocks


Engine Information:

• Oil: 10W30
• Harmonic Balancer/Damper: Internally Balanced
• Flex Plate / Flywheel: Internally Balanced


Recommended Components:

• Balancer: Internal balance
• Flexplate/Flywheel: Internal balance
• Head Gasket: .038" thickness or per application
• Oil: 10W30 Non synthetic for first 3000 miles
• Oil Filter: Wix or K&N per application

Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work for their application. Some modifications to the vehicle may be required using these and or other aftermarket parts.

Shipping Instructions

Shipping is free and lift gate will be provided.

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