This is a Underhead for the HPI F4.1 engine, HPIG1408.
Also refered to as the Head Button or Inner Head.
Goes between the heat sink head and the crankcase.
This is the part that the glow plug goes into.
Shiny Silver in Color
Diameter: 1.338" (34mm)
For the F4.1 only.
– If you need more information, use these HPI Racing resources –
This item is a replacement part for the following:
HPI Racing Nitro Star F4.1 Engine w/Pull Start
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