I have a NOS #58 cam I bought with some stuff and I wondered what it fit. Sounds like it is from a non US version since I can't think of any iron 3.5 with hydraulic valves.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT