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NITRO STAR 21BB S-25/Please tighten head screws equally.

Discontinued, replacement part: #1458

Aluminum Heat Sink Head for the Nitro Star 21 BB engine! This heat sink head will also fit similar engines that use the same underhead. This 11 fin machined aluminum head not only looks great, it is more durable and keeps the engine cooler for higher performance! Packaged with four head bolts and convenient Allen wrench.

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