Speed 21 V-SPEC Cylinder Head M3x16 Flange Hexagon Socket Screws - OS79871162 for O.S. Engine  [OS79871162]

M3x16 flange hexagon socket screws for RC cylinder heads

This fastening kit is made for retaining the cylinder head on engines referenced with Speed 21 V-SPEC in the product title. The set includes 10 pieces of M3x16 flange hexagon socket head screws intended to replace or service the fasteners used on compatible cylinder heads. The text focuses on the part function, noting these fasteners are specified for RC engine assembly and head service rather than general hardware use.

Installation advice: verify thread fitment and clean the mating faces before assembly, start each screw by hand to prevent cross-threading, and tighten in stages so the flange seats evenly. Keep track of screws during head removal and follow a progressive tightening sequence when reinstalling to preserve head flatness.

Role during tuning: these screws do not alter power output, but correct torque and uniform clamping are essential to maintain head sealing and avoid leaks that can upset engine running during tuning or track sessions.