GM Turbo 400 TH400 Quick Spool Valve System Designed to fit most applications

Designed to fit most applications with dual bolt patterns for Borg & Beck and Long-style clutch assemblies

These hardened lash caps are precision-machined and ground perfectly flat

If you're looking for headers designed for maximum street performance

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

Speedmaster has designed these pinion support stud kits to offer maximum clamping force and unmatched reliability

GM Turbo 400 TH400 Quick Spool Valve System Designed to fit most applicationsThe 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.