This is the RP8 Cold Glow Plug from OS Engines for use on Most Turbo Head Racing Engines.
FEATURES: For use with fuel containing 25% or greater nitromethane content Cold heat rating when outside...
This is the O.S. T-Series RP7 Cold Heat Range Turbo Glow Plug.
FEATURES: T-series glow plugs are ideal for racing car engines that create high RPM For .12, .15 and .21 size turbo head on-road racing...