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

91-series headsink replacement head

This headsink cylinder head is supplied as a direct replacement identified by the OS29064000 model reference, intended for use with the 91SZ-H.RZ-H family of RC nitro engines. It refreshes the external cooling face while maintaining internal dimensions and core components unchanged.

Fitting is routine for anyone familiar with nitro engine servicing: remove the original head, thoroughly clean gasket and mating faces, position the headsink evenly, and tighten bolts to the torque recommended by the engine maker. Avoid over-torquing and confirm correct sealing and clearances before the first run.

In service terms, this headsink head is intended to restore thermal transfer performance and provide a reliable mating surface for glow head and gasket set-ups. Check the 91SZ-H.RZ-H compatibility code on your engine before purchasing to ensure proper fitment.

Select this headsink when you need a direct replacement for engines marked 91SZ-H.RZ-H, and follow established maintenance and tuning procedures when installing and testing.