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

Headsink cylinder head for 91 series

This headsink cylinder head is a direct-scale 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 straightforward for users familiar with nitro engine maintenance: remove the original head, clean the gasket and mating surfaces, fit the headsink head evenly, and tighten fasteners to the engine manufacturer's recommended torque values. Do not overtighten bolts and inspect for proper sealing and clearance before first run.

In practical tuning terms, this headsink head acts as a service and maintenance part. It is used to refresh thermal transfer surfaces, enable consistent heat dissipation behavior, and provide a reliable mating surface for glow head and gasket setups. Verify compatibility against the published model code 91SZ-H.RZ-H prior to purchase.

Choose this part when you need a like-for-like headsink replacement for engines identified by 91SZ-H.RZ-H, and follow standard engine maintenance practice when installing and tuning.