American car automobile V8 LPG Kit Timing advance Propane MSD Autronics 40672 CNG IgnitionAmerican automobile V8 LPG Kit Timing advance re curve Propane MSD Autronics 40672 CNG Ignition alters timing automatically to run different advance curve required by Propane LPG CNG fuels very rare discontinued still some left! MSD Ignition 40672 CNG LPG timing master for propane cng fuels This amazing box will advance timing so at full advance a lot earlier which is whats needed with LPG while allowing easy starting which is not going to happen if