Magneto HEI Distributor Internal Ignition Coil Only When they do

When they do

Convert your GM Turbo 400 into a 2 speed by using the Speedmaster billet aluminum intermediate clutch pack insert

and work with stock components

increases valve train life dramatically

and cable--no modifications are required for installation

Magneto HEI Distributor Internal Ignition Coil Only When they doFailure or poor performance from a coil can result in a misfire, a rough running, hard starting engine, and excessive emissions. Speedmaster's ignition coils provide the performance needed to help keep vehicles running the way that they were designed. These coils have corrosion protected laminations to protect coils from the harsh operating environment