LS7, LS3, and LS9 Cylinder Heads Earlier Gen III LS heads, such as those found on LS1, LS6, and various Q Series truck engines, feature tall intake ports referred to as “cathedral” ports. The cathedral-roof shape at the top accommodates the fuel-injector path. The LS2 engine also features cathedral-port heads but is technically considered a […]
How to Choose the Best Cam & Lifters for a Gen IV LS-Engine
Today’s performance aftermarket offers a wide selection of camshaft profiles for enhanced performance, from street-mild to all-out racing competition. While factory camshafts all utilize hydraulic roller lifters, the performance aftermarket offers lifter application in both hydraulic and solid designs. One very significant feature of the LS cam design is its cylinder firing order. While the […]
What is an LT-Engine: The Complete Guide to Understanding GM’s Marvel
Ever since the release of the original small-block Chevy in 1955, Chevrolet engines have been the king of all engine swaps. Some of this is due to the sheer production volume of these engines, but in modern times, aftermarket support and ease of installation has allowed Chevrolet to continue dominating the realm of engine swaps. […]
Gen IV LS Turbo Shootout! Choose the Best for Power
For maximum power production, it’s hard to beat boost from a turbocharger. The cheap-date method for LS owners is to find a 5.3 truck engine in the junkyard then install a cam, springs, and turbo system. This combination has powered some serious street machines, and the same philosophy can be applied to LS3 and LS7 […]
How to Choose the Best LS Gen IV Engine Block
Engine blocks in the LS family share similar characteristics, with deviations primarily based on cylinder bore size. One of the primary differences between Gen III and Gen IV blocks is the relocation of the camshaft position sensor, which was moved from the Gen III location at the rear top of the block to the timing […]
Gen IV LS-Engine: Nitrous Oxide Combos for Power
When it comes to bang for the buck, nothing compares to nitrous oxide. Toss in the fact that it is easy to install (and conceal) and the power output is adjustable (as with forced induction). It’s easy to see why nitrous oxide is all the rage among street racers and enthusiasts. Short of a well-prepared […]
Gen IV LS Cylinder Head Shootout! Choose the Best for Power
Working with the intake and camshaft, the cylinder heads are part of the trio of performance components that dictate the power output of the engine. In the case of the LS3 and (especially) LS7, the factory heads offer exceptional airflow. Unlike cathedral-port heads (706, 317, 243, etc.), it is difficult to improve upon the power […]
How to Install the Right Fuel Pump on an LT-Swap
When it comes to fuel pumps, there are two categories: in-tank or external. The in-tank pumps are more complicated to install, but they tend to last longer, hold higher pressure, and run quieter. Retrofitting an in-tank pump costs more, but the cost is worth it in reliability. There are two ways to add an in-tank […]
How to Choose Performance Pistons for Gen IV LS Engines
The OEM pistons for LS engines are all cast hypereutectic construction except for the LS9 with its factory-forged pistons. Don’t be alarmed about the “cast” term. Unlike earlier cast pistons, hypereutectic pistons feature a dense casting process with high silicon content. They’re stronger than old-school cast pistons, and they’re more stable in terms of thermal […]
Best Camshafts for Performance: Gen IV LS Engines
One of the most misunderstood performance components on any LS engine has to be cam timing. The difficulty is only compounded when you add things such as nitrous oxide, turbos, or superchargers. From an anatomical standpoint, the camshaft can be likened to the brain because the cam profile determines how effectively (when and where) breathing […]
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