LS Gen IV Engines 2005 - Present: How to Build Max Performance

Descripción

From the Publisher The GM LS Gen IV engine dominates the high-performance V-8 market and is the most popular powerplant for engine swap projects. In stock trim, the Gen IV engines produce class-leading horsepower. The Gen IV's rectangular-port heads flow far more air/fuel than the Gen III cathedral-port heads. However, with the right combination of modification procedures and performance parts, you can reach almost any performance target. Muscle car owners, LS engine builders, and many enthusiasts have migrated to the Gen IV engine platform, so clear, concise, and informative content for transforming these stock engines into top performers for a variety of applications is essential. Engine Overview The aftermarket has stepped up to offer both iron and aluminum LS blocks that provide more latitude in overboring and stroking, in addition to enhancements that provide superior oiling, cooling, and, most important, strength . Blocks Some aftermarket LS blocks feature the six-bolt head-bolt design, with extra upper and lower head bolt holes added at each cylinder location, as shown on this Dart LS Next block. Head studs provide added strength. Rotating Assembly All Gen IV cranks feature a 58-tooth reluctor wheel. When purchasing a new crank, make sure that the reluctor wheel is already installed. If you buy a crank and the wheel is separate, a special indexing tool is required to position the wheel in the correct clock position. Goodson Tools & Supplies offers such a tool. Cylinder Heads Cast-in rocker pedestals are integral to the LS7 heads. The radiused pockets allow rockers to be directly bolted to the heads without the need for a separate rocker mounting rail. Dart LS Next Build This 440-ci build began with a Dart LS Next block featuring Trick Flow LS3 style heads. Displacement was achieved with a 4.185-inch bore and 4.000-inch stroke. Pistons Antifriction piston skirt coatings are available already installed on new pistons, as shown in this example, or by sending your pistons to a specialty coating service. Cams & Lifters An example of a VVT delete kit from Trick Flow Specialties, PN 30678505. A new timing cover (type LS2/LS3) featuring the camshaft phaser actuator is included to replace the VVT cover. (Photo Courtesy Trick Flow Specialties) Rocker Arms Note the intake rocker offset on this example of individual-mount steel roller rockers for an LS7 application. (Photo Courtesy T&D Machine) EFI & Intake Manifolds Edelbrock’s Pro-Flo XT LS injection system features a large plenum and tapered runners for a broad torque band. This setup reportedly provides an increase of 30 hp over a stock LS6 manifold. Applications for this manifold include LS1/LS6 and LS2. The manifold is offered in either satin or black. The management system includes everything needed for installation. (Photo Courtesy Edelbrock) Review: Must read for anyone looking to build an LS - This book has a lot of good information and recommendations. Although this book mostly pertains to Gen IV LS motors, anyone looking to build a Gen III LS could also benefit from this as well. As in my case I own a 98 C5 Corvette, with an LS1. I've also purchased Chris Werners "How to Rebuild GM LS Series Engines" as well. Another good read with a lot of good information. After reading both of these I think I'll stick with doing a high performance build on my cars original LS1, which only has 58,000 miles on it. Nothing wrong with it, I just want more power and would like to see it make power to 7,500 RPM like my old 70 Boss 302 would. Review: DIY LS engine performance - Had alot of questions about this Very popular 6.2l LS im going to rebuild. Discovered that i can substitute the lifter trays with verticle-bar high lift roller lifters. AFM and DOD helpful info. Its a useful book for the LS.