Item # 22661 BRAND: ATK Engines

ATK GM LM7 383 Stroker 540+ HP Base LM7-LB-4 Engine

ATK LM7-LB-4 GM LM7 383 Stroker Base Engine 540HP
ATK LM7-LB-4 GM LM7 383 Stroker Base Engine 540HP
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$7,590.00
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ATK LM7-LB-4 GM LM7 383 Stroker Base Engine 540HP

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ATK GM LM7 383 Stroker 540+ HP Base LM7-LB-4 Engine

Product Overview:

Description

Your car gets a major makeover with the ATK LM7-LB-4 GM LM7 383 Stroker 540HP Base. Extremely streetable 540+ horsepower and 500+ torque is more than enough to leave a lasting impression on the tracks. This base engine is perfect for completing the muscle ride with your existing components.

Engine Specifications:

  • Horsepower: 540+
  • Torque: 500+
  • Block: LM7 5.3L Gen 3
  • Bore/Stroke: 3.903 x 4.000
  • Year Range: 1999-2007
  • Displacement: 383CI
  • Crankshaft: K1 4340 Forged 24 tooth reluctor
  • Connecting Rods: Scat 6.125" Forged I Beams with ARP 8740 Bolts
  • Pistons: Wiseco 2618 Forged
  • Piston Rings: Wiseco GFX (Steel top ring)
  • Compression Ratio: 10.4:1 Compression
  • Camshaft: Hydraulic Roller
  • Camshaft Specifications: 228/234 @50 .604/.609 112LSA
  • Camshaft Bearings: Installed & Clocked to OEM Position
  • Cylinder Heads: CNC Ported Cathedral Port cores 2.02/1.60, dual valve springs, titanium retainers
  • Rocker Arms: OE Rocker Arms with trunion upgrade
  • Oil Galley Plugs: Installed & Sealed
  • Weight: 412

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

Reviews

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Questions & Answers

Would this motor work in a 98 trans am as far as factory wiring?

Asked by: BigRed03
This is a base long block (22661) shipped with the block, internal components and aluminum cylinder heads. There are no electrical components shipped with this engine. Weather your stock wiring will work with this application will be determine by what electrical components you may choose to use after installing this engine. Eastwood offer a complete line of wiring stems by Painless Performance Products that may assist your with your engine swap. You can contact Painless Performance Products Tech @ 1-888-350-6588 with questions pertaining to your application.
Answered by: vince
Date published: 2020-11-16
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ATK GM LM7 383 Stroker 540+ HP Base LM7-LB-4 Engine
$7,590.00
In Stock