American car automobile V8 Dual Curve LPG Kit Timing advance Propane MSD Autronics 40672 CNG Ignition

American automobile V8? LPG Kit? Timing advance? re-curve Propane MSD Autronics 40672 dual curve unit CNG Ignition alters timing automatically to run different advance curve required by Propane / LPG CNG fuels very rare discontinued still some left!? 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 you just wedge timing weights or lock them out- gives far better MPG and power to your motor ,a real steal at these discontinued parts - grab a bargain will fit virtually any car V8 or UK running on CNG or LPG- but will fit all others American or whattever- see instructions at bottom of Listing just in series with MAF sensor on airbox