Pro HEI RPM Replacement Ignition Module (Suits New HEI 6000 Series) Convert the Speedmaster Powerglide tail

Convert the Speedmaster Powerglide tail housing to accept a TH350/Powerglide yoke with the billet steel tail housing adapter

They're roll-threaded

to provide maximum performance

The Speedmaster valve locks will fit any Speedmaster 10 degree retainer and are recommended for all race applications due to their superior strength

long cable

Pro HEI RPM Replacement Ignition Module (Suits New HEI 6000 Series) Convert the Speedmaster Powerglide tailSpeedmaster offers budget pricing and big performance with their ignition controller modules. The modules improve performance with multiple spark, more spark, and ensured combustion for a cleaner burn to set the streets on fire. Speedmaster ignition modules will show you the benefits of greater throttle response, smoother idle, and full power output at high rpm. Fire your engine for less with Speedmaster ignition controller modules.