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

Flange hex socket head screws for precision cylinder head work

This 10-piece set provides M3x16 flange hexagon socket head screws intended specifically for cylinder head retention on engines referred to as Speed 21 V-SPEC in the product title. The kit is supplied to replace or service the fasteners fitted to compatible cylinder heads and is described for RC engine assembly tasks rather than generic fastening uses.

Assembly tips: check that the head uses M3 tapped holes and ensure mating surfaces are clean prior to installation. Begin each screw by hand to avoid cross-threading and tighten progressively in a criss-cross pattern so the flange seats uniformly. Keep replacements to hand during head removal and gasket work to avoid interruptions.

Effect on tuning: these screws will not change output, but correct torque and uniform clamping are important to preserve the head seal and prevent sealing issues that can affect engine response and tuning consistency on the track.