The Chrysler Big Block Ultra Serpentine Conversion Kit from March Performance delivers precision engineering, improved reliability, and modern performance for Mopar 383, 400, and 440 engines. Designed to replace outdated V-belt systems, this 6 rib serpentine setup provides superior belt grip, high-strength alignment, and smooth accessory operation under demanding conditions. Each component is CNC-machined from 6061-T6 billet aluminum for maximum durability and a perfect fit. The compact bracket design efficiently mounts a GM 10SI alternator and Sanden 7176 A/C compressor, while the precision idler ensures optimal belt wrap for consistent, no-slip performance. Finished in maintenance-free clear or black powder coat, this serpentine kit combines long-term reliability with show-quality aesthetics. Ideal for high-performance Mopar builds, the March Performance Ultra Serpentine Conversion Kit optimizes accessory drive efficiency while enhancing the engine bay’s clean, professional appearance.