Description
Bosch:7580
Confirmed Vehicle Application
1993 Cadillac 60 Special (4.9L V8, GAS, OHV, Naturally Aspirated)
General Application Type
Even though only one exact vehicle is listed, the design of the HR9DCY / 7580 plug (copper core, 1.5 mm gap) suggests it is commonly used in:
Older American V8 engines
Vehicles requiring HR9DCY‑spec heat range and thread dimensions
Engines compatible with cross‑reference plugs such as ACDelco R45LTS6, NGK TR55, Champion RS14YC6, Autolite 106, etc. (These
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