The HSA-027/BU is a 13-fin cooling head shaped to the Tamiya F350 HILUX fin layout and promoted for Savage use, finished in blue for easy visual matching with common nitro builds.
Fitting is straightforward: remove the existing cooling head, slide this heatsink over the engine's head, then fasten with the head screws already on the engine. On Savage-style installations you should not need extra brackets or chassis changes.
By increasing the heat-shedding surface, this heatsink lowers head temperatures during extended high-RPM running and helps keep tuning more predictable across different fuel and jetting tests. It is a thermal management accessory, not a horsepower upgrade.
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