XACT Prolite Flywheel GM LS Series 1997-04

The XACT Prolite Flywheel GM LS Series 1997-04 from Advanced Clutch Technology is engineered for LS engine builders and performance enthusiasts who demand lightweight, SFI-certified components that enhance throttle response and reduce parasitic losses. This chromoly flywheel replaces heavy cast-iron originals, directly improving acceleration and engine efficiency in street, strip, and track applications where every tenth of a pound matters.

Constructed from premium chromoly steel, the XACT Prolite features internal balance geometry that maintains crankshaft harmony without external counterweights—critical for naturally aspirated and forced-induction LS builds. At 14.6 pounds, this flywheel cuts approximately 50% of the weight compared to factory pieces, reducing rotational inertia and allowing the engine to rev faster with measurably quicker spool-up on turbocharged or supercharged platforms. SFI 1.1 certification ensures safety in high-RPM environments and compliance with sanctioning body regulations for organized competition.

LS engine swappers and restomod builders benefit most from this flywheel's balanced design and proven durability across street and race contexts. Compatible with 1997–2004 GM LS-series engines (and later block variants sharing the same bellhousing pattern), installation requires standard flywheel tools and proper clutch alignment techniques. Verify your specific LS variant and clutch pressure plate compatibility before purchase to ensure seamless integration with your driveline setup.