Novarossi REX 0.20mm Copper Head Gasket Shim
[NVR03901]

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This is a replacement Novarossi 0.20mm Copper Head Gasket Shim, and is intended for use with the Novarossi REX R57HR-3D helicopter engine. These shims are used to raise or lower the deck height of the engine to adjust the compression ratio according to the nitro content in the fuel being used. Fuels with higher nitro content will require that you increase the deck height to avoid detonation. Check the manufacturers recommendations to determine adequate deck height for your application.