On the V8 front, the LS1 engine was bumped to 335 hp, similar to what the C5 Corvette had. Paired with a six-speed manual, the upgraded LS1 gave the VZ Commodore SS a 0-62 mph time of 6.3 seconds.

General Motors replaced its popular LS1 engine with the LS6 in 2001. By 2006, they had already been replaced by the LS7. Why didn't it stick around?

Around 2002, some of the LS1 engines started receiving the improved LS6 parts such as the intake manifold, heads, and stronger block. The 2004 GTO also fielded the LS1 (350 hp).

Drivetrain. Chad is not one to leave well enough alone, so the 5.7-liter LS1 that powers his Cherokee isn't stock. The engine is bored to .020 over stock, has 706 heads, an LS2 intake, a 92mm ...

Among the Gen III engines produced from 1997 to 2007, there are essentially two to three head designs. The early design is the most common, which is based off the original LS1 ("241" casting) head.

When he tells them it's an LS1 Corvette engine (closely related to the 4.8-, 5.3-, and 6.0L Vortec truck engines), ... Mike spit out the ZR2's stock 1310 series CV-joint-equipped front driveshaft.