This is the RP8 Glow Plug for use in the OS Max .21 VZ-B V-Spec and most other .18 -.28 cu in (2.9 - 4.6 cc) turbo head racing engines. FEATURES: For use with fuel containing 25% or greater nitromethane content Cold heat rating when outside temperature is high SPECS: Overall Length: 17mm (.67") Thread size: M8x.75mm COMMENTS: This glow plug is different from the conventional glow plug. It is made to fit the inner head of engines with a turbo-type cylinder head design.
How to Choose the Right Glow Plug? Please refer to the following link.http://www.osengines.com/accys/choosing-glowplugs.html
