Supertech Valve Spring & Retainer Kit for Honda D-Series Supertech:Default Title Being the multivalve piston technology

Being the multivalve piston technology leader

The distinctive dual-outlet configuration provides both visual impact and enhanced exhaust scavenging

Ideal for track-focused builds seeking maximum horsepower gains and responsive throttle characteristics

and the finest tolerances guaranteeing exact fitment

Action Clutch's lightweight flywheel engineered to deliver measurable performance gains through reduced rotational mass

Supertech Valve Spring & Retainer Kit for Honda D-Series Supertech:Default Title Being the multivalve piston technologyEngineered for high revving D Series engines, this Supertech valve spring and retainer kit delivers the precision valve control needed for aggressive cam profiles and elevated RPM applications. Premium materials and tight tolerances ensure consistent performance and durability under extreme conditions. Direct bolt on fitment eliminates guesswork, making it an essential upgrade for serious Honda tuners pushing their engines to the limit.