ACT 1977 Chevrolet K5 Blazer XACT Flywheel Prolite 1999-audi-a6-quattro-base-esi1019583 the rest have a grooved

the rest have a grooved bearing on the block side only

This allows it to fit in a garage when not being used

Sometimes you want All-Weather Protection

ACL Nissan RB30/RB30ET Turbo Standard Size High Performance Main Bearing Set - CT-1 Coated

ACT 1977 Chevrolet K5 Blazer XACT Flywheel Prolite 1999-audi-a6-quattro-base-esi1019583 the rest have a groovedDramatically improved engine response and acceleration, mild to moderate gear rattle; Heat treated forging for strength and toughness, induction hardened ring gears for maximum life; One piece construction allows less opportunity for failure and provides uniform efficient heat transfer from the clutch disc. No more warped inserts or loose ring gears; Recommended for race use; Forged, CNC machined and dynamically computer balanced for smooth high RPM