Distributor Cam Sync Plugs
The MSD Coil-Per-Cylinder Ignition System, PN 7600, requires a cam sync signal for the firing order of each coil. MSD engineers incorporated a Hall Effect Switch into the distributor plug to make things easy for you! This way, the oil pump is driven, the distributor hole is sealed and the ignition receives a sync signal. The billet aluminum housing is fit with a ball bearing to guide the polished steel shaft. An iron gear is installed.

Chevy V8, w/Slip Collar
PN 8514

Ford Cam Sync Distributor Plug, 302
PN 8522

Ford Cam Sync Distributor Plug, 351W
PN 8506

Ford Cam Sync Distributor Plug, 351C/M–460
PN 8521