GM Turbo 400 TH400 Quick Spool Valve System They are heat-treated and threads

They are heat-treated and threads are rolled to provide up to ten times more fatigue strength

They are individually hand turned and pressure tested to exceed performance standards

that's 50 percent less backlash than other competitive cables on the market

Aggressive

The successful formula of offering a complete engine drive accessory kit has now been applied to the Serpentine with Speedmaster pulley systems

GM Turbo 400 TH400 Quick Spool Valve System They are heat-treated and threadsThe Speedmaster quick spool system is a pressure relief system for the Turbo 400. This system dumps the converter outlet pressure, loosening the converter and helping spool the turbo quickly. This system can be wired directly to the transbrake wire. The quick spool system can be initiated via a switch, timer, or digital output signal.