Colsibro Valve Guide Set | Renault F4R
FrogJam Motorsport Colsibro Valve Guide Set – Renault F4R Cylinder Head
Unlock superior reliability and performance with the FrogJam Motorsport Colsibro valve guide set, engineered specifically for the Renault F4R cylinder head. Colsibro’s advanced copper‑nickel‑silicon alloy delivers exceptional strength, outstanding wear resistance, excellent heat transfer, and reduced friction—a clear upgrade over traditional bronze guides.
Each FrogJam Motorsport guide is designed with precision‑focused enhancements, including:
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Installation lip for easier fitting and guaranteed depth accuracy
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Rounded exhaust guide ends to optimise heat management under extreme temperatures
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Tapered intake guide design to promote smoother, more efficient airflow
With a 5.5 mm inner diameter, these guides are a direct fit for most OEM F4R valves found in the Clio Mk2/Mk3 RS and Megane Mk2 RS.
Sold as a set of 16 valve guides (8x intake and 8x exhaust).