Item # 22715 BRAND: ATK Engines

ATK Chrysler 408 Mag Short Block Forged -20.5cc Dished SP57 Engine

ATK SP57 Chrysler 408 Mag Short Block 20.5cc Price Includes $510 Core Charge
ATK SP57 Chrysler 408 Mag Short Block 20.5cc Price Includes $510 Core Charge
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ATK SP57 Chrysler 408 Mag Short Block 20.5cc Price Includes $510 Core Charge

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ATK Chrysler 408 Mag Short Block Forged -20.5cc Dished SP57 Engine

Product Overview:

Description

The ATK Chrysler 408 Mag Short Block 20.5cc is designed for high horsepower engine applications. This hand-built and balanced unit is assembled with cast iron engine block, forged internally balanced crankshaft, forged connecting rods, and forged dished pistons for extremely tough use.

Engine Specifications:

  • Block: Seasoned OE Magnum
  • Bore/Stroke: 4.040 x 4.000
  • Displacement: 408 C.I.D.
  • Crankshaft: Scat 4340 Forged 4.000" Stroke Internally Balanced
  • Connecting Rods: Scat 4340 Forged I Beam 6.123" ARP 8740 Bolts
  • Pistons: Forged Dished +20.50cc
  • Piston Rings: Moly Rings
  • Compression Ratio: 62cc=10.2:1/68cc=9.6:1/72cc=9.3:1
  • 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

In the Box

Guides & Accessories

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Questions & Answers

Is oil been restricted so want burn out bearings built one kept eating bearings

Asked by: David 408
We apologize for the confusion and inconvenience. We would have to advise you to speak directly to the manufacturer as these items drop ship. They can be reached by calling 866-721-2315.
Answered by: Kelly H
Date published: 2021-08-13

This is a pre-89 LA block right? I see mag in the title...

Asked by: Chuck
The one in the picture has the shaft rocker oiling hole in the deck.
Answered by: Pud13
Date published: 2021-01-29
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ATK Chrysler 408 Mag Short Block Forged -20.5cc Dished SP57 Engine
$7,952.00
In Stock