HPI Racing Underhead F4.6Tower Stock# LXTHF1 • Manufacturer Stock# 1447
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.
Aluminum construction, silver in color
Installation following the engine manual
Diameter: 1.40" (36mm)
For the cylinder head order HPIG1490