ATK Chevy LM-7/LS 347CI Short Block Engine -11cc Dished Pistons 24 Tooth SP76

Item #22726 Brand:ATK Engines

Made in the USA
ATK Chevy LM-7/LS 347CI Short Block Engine -11cc Dished Pistons 24 Tooth SP76
ATK Chevy LM-7/LS 347CI Short Block 11cc Dished Coated Skirts
* ** 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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If you are building a high-performance engine, then you will need this ATK Chevy LM-7/LS 347CI Short Block. It comes with Scat Premium Pro 4340 forged pistol to handle horsepower up to 700HP. Internally balanced OE Reground 3.622" crankshaft and Scat Premium Pro 4340 forged connecting rods ensure optimal performance of the short block.

Short block Specifications:

  • Block: GM LM7 5.3L
  • Bore/Stroke: 3.903 x 3.622
  • Displacement: 5.7/347 C.I.D.
  • Crankshaft: OE Reground 3.622" Internally Balanced 24 Tooth
  • Connecting Rods: Scat Premium Pro 4340 Forged I Beam 6.125" ARP 8740 Bolts
  • Pistons: Wiseco 2618 Forged -11cc Dished - Coated Skirts
  • Piston Rings: Wiseco GFX (Alloy Steel top ring)
  • Compression Ratio: 65cc= 9.7:1 / 67cc= 9.5:1 / 70cc= 9.2:1
  • 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


ATK High Performance Chevy LM7 5.7L/347 Short Blocks


Engine Information:

• Oil: 5W30
• Harmonic Balancer/Damper: Internally Balanced
• Flex Plate / Flywheel: Internally Balanced

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 Information

Shipping is free and lift gate will be provided.

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