91SZ-H.RZ-H Headsink Cylinder Head for OS29064000 by O.S. Engine  [OS29064000]

Headsink cylinder head built for the 91 series

This headsink cylinder head is a direct replacement accessory identified by the model code in the product name, intended for use on the 91SZ-H.RZ-H family of RC engine heads. The item serves as a replacement head designed to restore or alter cooling characteristics without changing engine displacement or core internal components.

Installation is simple for those experienced with nitro engines: remove the original head, clean the gasket and mating faces, seat the headsink evenly, and tighten fasteners to the engine manufacturer's recommended torque values. Avoid overtightening and confirm sealing and clearance before the first run.

From a tuning and service perspective, this headsink head refreshes the thermal transfer surface to promote consistent heat dissipation and provides a stable mating surface for glow head and gasket assemblies. Confirm the engine model code 91SZ-H.RZ-H before ordering to ensure correct fitment.

Choose this part when you require a like-for-like headsink replacement for engines identified by 91SZ-H.RZ-H, and follow standard engine maintenance procedures during installation and break-in.