PHOSPHOR BRONZE UPGRADED VALVE GUIDES INLET INTAKE 6.0MM SR20 SR20DET

8 X SR20DET Inlet - 10.03mm OD - 6mm ID. PHOSPHOR BRONZE VALVE GUIDES. Superforma chose to manufacture their valve guides from Phosphor Bronze (Cn-Sn-P Alloy) based on it's proven ability to dissipate heat and low friction properties.

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