3 Bolt Spline Drive Assy SBC w/ATI / MSD

The Peterson Fluid 3 Bolt Spline Drive Assembly for Small Block Chevy with ATI/MSD compatibility is a precision-engineered crank drive system built for high-performance engine builders and restomod specialists who demand reliable belt drive and accessory synchronization. This aluminum spline drive assembly interfaces directly with ATI harmonic balancers and MSD crank trigger wheels, making it the go-to choice for builders running aftermarket ignition and accessory systems on classic and modern small block Chevy platforms.

Constructed from lightweight aluminum with black anodized finishing, the three-bolt design provides secure engagement while minimizing rotational mass that can compromise engine efficiency. The spline drive configuration ensures zero slippage between crank and accessory pulleys—critical when running electronic ignition systems that depend on precise timing signals from MSD distributors or crank triggers. At 1.33 lbs, this assembly adds minimal weight while delivering the mechanical precision required for stable RPM sensing and fuel injection tuning on carbureted or fuel-injected small block applications.

Engine builders working on muscle cars, street rods, and performance trucks rely on this spline drive assembly when integrating modern ignition control or accessory systems into existing or rebuilt small block engines. The Peterson Fluid spline drive is particularly valued in restomod builds where vintage engine bay aesthetics must coexist with modern electrical and fuel management. Its compatibility with both ATI harmonic balancer hubs and MSD ignition trigger wheels makes it an essential hub component for anyone standardizing their crank-driven accessory architecture on the small block Chevy platform.