Few engine families have achieved the near-mythical status of General Motors' LS V8 series. Known for being compact, straightforward, and incredibly versatile, these powerplants have driven everything from heavy-duty pickup trucks to high-performance muscle cars. While the history of GM power is vast, the modern Gen III and Gen IV small-block architecture remains the gold standard for enthusiasts. Below are seven of the most significant engines from this era, ranked by their output.
LS2: The 400-Horsepower Foundation
Replacing the original LS1, the LS2 brought significant advancements to the C6 Corvette. With a displacement increase to 6.0 liters, a new block casting, and a higher compression ratio (10.9:1), it delivered 400 horsepower and 400 lb-ft of torque. Beyond the Corvette, it powered notable vehicles like the Pontiac GTO, the Trailblazer SS, and the first-generation Cadillac CTS-V.
LS6: The High-Performance Pioneer
Introduced in 2001 for the C5 Corvette Z06, the LS6 redefined the small-block’s potential. Despite sharing some architectural DNA with the LS1, it utilized a more aggressive camshaft and refined cylinder heads. This allowed it to punch above its weight, reaching 405 horsepower and 400 lb-ft of torque. It remains a historic milestone in the small-block timeline.
LS3: Refining the Formula
Serving as the core of the C6 Corvette from 2007 to 2013, the LS3 was designed to balance performance with tightening emissions standards. Engineers pushed the displacement to 6.2 liters, incorporating rectangular-port cylinder heads and larger fuel injectors. This evolution resulted in a robust 436 horsepower and 428 lb-ft of torque, solidifying its place in vehicles like the Camaro SS and Chevrolet SS Sedan.
LS7: The Naturally Aspirated Titan
The LS7 represents the pinnacle of naturally aspirated performance within the family. Featuring a massive 7.0-liter (427 cubic-inch) displacement, this hand-built engine produces 505 horsepower and 475 lb-ft of torque. Known for its all-aluminum construction and dry-sump oiling system, it transformed the C6 Z06 into a world-class supercar, capable of a 0-60 mph sprint in 3.6 seconds.
LSA: The Supercharged Force
Unlike the others, the LSA was engineered specifically for forced induction. Found in the second-gen Cadillac CTS-V and the fifth-gen Camaro ZL1, this 6.2-liter engine utilizes a supercharger to generate 580 horsepower and 556 lb-ft of torque. The LSA stands out for its high-flow rotocast cylinder heads and a liquid-to-air intercooling system designed to handle extreme heat and pressure.
LS9: The Ultimate Supercharged Legend
Topping the list is the LS9, the most powerful engine of the group. Exclusively reserved for the C6 Corvette ZR1, this 6.2-liter powerhouse features a massive 2.3-liter supercharger and upgraded internal components. The result is a staggering 638 horsepower. With this engine, the ZR1 achieves blistering speeds, hitting 60 mph in 3.4 seconds and reaching a top speed of 205 mph.
«The LS9 stands as a testament to what GM engineers could achieve when tasked with creating the ultimate small-block performance machine.»