COVID-19 UPDATE: We’re here for you and shipping fast, prioritizing health and safety first. Learn More

ATK Chrysler 408 Mag Short Block -23.5cc Dished SP61 Engine

Item #22716

ATK Chrysler 408 Mag Short Block -23.5cc Dished SP61 Engine
ATK SP61 Chrysler 408 Mag Short Block -23.5cc
- +
Quantity: close

In stock

< Back


The ATK Chrysler 408 Mag Short Block is designed for high horsepower engine build. Boasting cast iron block, this short block is fitted with internally balanced nodular iron crankshaft, forged connecting rods and sealed freeze plugs for highly withstanding and trouble-free use.

Engine Specifications:

  • Block: Seasoned OE "Magnum" Block
  • Bore/Stroke: 4.040 x 4.000
  • Displacement: 408 C.I.D.
  • Crankshaft: Scat Nodular Iron 4.000" Stroke Internally Balanced
  • Connecting Rods: Scat 4340 Forged I Beam 6.123" ARP 8740 Bolts
  • Pistons: Hypereutectic -23.5cc Dish
  • Piston Rings: Moly Rings
  • Compression Ratio: 62cc=9.7:1 /68cc=9.2:1/70cc=8.9:1
  • Camshaft Bearings: Installed & Clocked to OEM Position
  • Freeze Plugs: Brass Installed & Sealed
  • Oil Galley Plugs: Installed & Sealed
  • Weight:285

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

More info...


ATK High Performance Chrysler 408 A 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: .048" thickness or per application
• Oil: 10W30 Non syntheitc 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.

Eastwood Offers Free Lifetime Technical Support

Click here for product SDS information

Attention California Residents - Proposition 65

Proposition 65 Warning WARNING - Cancer and Reproductive Harm -

Customer Reviews

Questions & Answers