O.S. Engines 71641800
For 21 class racing engines of T-type inner head. Use when atmospheric temperature is high.

FEATURES:

• For use with fuel containing 25% or greater nitromethane content
• Cold heat rating when outside temperature is high

INCLUDES: One O.S.RP8 glow plug

REQUIRES: Glow plug wrench, HCAP2550

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.