1971 PORSCHE 911 ST RACING PART - pn 901.107.285.20

A perfect reproduction of the OEM 911 ST Preschona Oil Pressure Relief Valve, many years in the making. This is a 'first generation' exacting copy of my "NOS" original Preschona Valve and not 'a-copy-from-a-copy' produced by anyone else. In order for me to reproduce this rare oil pressure relief valve, my "OEM" and "NOS" valve was used. Unlike the later 911 RSR, the Preschona Oil Pressure Relief Valve is adjustable which allows control of the opening pressure. Without question, an indispensable dry-sump lubrication system component of an endurance Porsche vintage race car--the valve protects the external oil coolers from over-pressure during warm-up and cold-starts.

Please send inquiries to; AJSERRANO @ MSN dot COM. Thank you~