Description
By: Mike Mavrigian .
Models Covered:
LS1 / LS6, LS2 and LS7 / SL3 / SL9. Featuring a 625 HP LS2 buildup.
Description
The IS generation of Chevy/GM engines has set new standards for engine performance in the enthusiast and racing worlds. Engine builder and writer Mike Mavrigian has written a complete handbook featuring a 625 HP buildup of an LS2 with part numbers, clearances, specifications, full assembly, and dyno test results.
The procedures and aftermarket performance parts selections in this example also apply to all IS engines, including the LS1, LS6, LS2, LS3, LS7, and LS9.
Other topics include:
- Overview of IS engine models
- OEM and aftermarket blocks
- OEM and aftermarket cylinder heads
- Bore and stroke combinations
- Bottom-end prep
- Cylinder head reconditioning and rebuilding
- Step-by-step LS2 performance build
- LS camshaft theory
- FAST EFI upgrade
Introduction
The LS family of GM engines represents substantial design changes and performance enhancements as compared to the early generations of what I'll generically refer to as the small-block Chevy engine. The LS2 is based on a 6.0L block and is a great choice for a performance build, able to take advantage of a wide range of performance aftermarket components. In this book, I primarily focus on the LS2 version and offer tips on building a performance-oriented engine to be used as either a replacement engine or as a swap engine in a custom, streetrod or muscle car vehicle. This book deals strictly with the build of the engine and does not deal with in-depth tuning or installation into a vehicle.
This book is intended to provide parts selection, fitting and assembly of the LS engine from a performance standpoint, primarily referring to the 6.0L LS2 as an example. So while I provide a bit of GM factory OE (original equipment) background and info on a number of OE parts that will be needed, the primary focus is building a performance engine, primarily using aftermarket components.
All LS factory specifications (torque specifications, bearing clearances, etc.) are provided. In order to help illustrate a performance build, I built a specific LS2 as an example, which I refer to as "Project LS2" throughout this book. While I focused on the LS2, all LS engines share essentially the same attributes in terms of clearances and assembly procedures.
The build I mention involves the use of a new LS2 aluminum block, slightly overbored and with a longer stroke as the basis of the build that produce 625.4 hp and 534 ft-lb (at the flywheel) on an engine dyno. We'll feature performance aftermarket components, including crankshaft, connecting rods, pistons, camshaft, lifters, rockers and cylinder heads. Whether you plan to turn your factory LS2 into a little thumper, or start from scratch with a brand-new block, the information provided here should be of assistance.
While all LS platform engines are relatively the same, in Chapter 1, I also discuss the differences and nuances of the LS7, LS3 and LS9 engine versions to serve as a reference for your particular project.
Mike Mavrigian
