GT15 Heatsink Head Upgrade OS28154000 for O.S. Engine GT15HZ  [OS28154000]

GT15 Heatsink Head Overview

This O.S. Engine heatsink head OS28154000 is an RC-scale cylinder head engineered as a direct replacement or upgrade for GT15 nitro engines where the factory designation GT15HZ is used. The description stresses correct fit and installation practice, and it concentrates on serviceability and tuning implications rather than marketing claims.

Compatibility is limited to GT15-designated engines, so confirm your engine code and physical clearances before fitting. The finned head seats on the cylinder and aligns with head studs; accurate screw torque and clean mating surfaces are critical to preserve sealing and predictable thermal performance during use.

From a tuning standpoint, this cylinder head changes combustion chamber cooling and can influence operating temperatures during runs. When swapping heads, check glow plug and carburetor clearances as well as bodywork fit, then perform warm-up and idle checks before extended full-throttle testing.

Use this heatsink head as a like-for-like option for GT15 engines to maintain consistent cooling behavior during tuning and track sessions, and follow standard nitro engine maintenance and torque procedures when installing.