Are the valves hardened on the old 352 ford?

Are the valves hardened on the old 352 ford?

Added (1). am putting it in a 74 ford truck /will it run ok on unleaded gas, thanks

Was not designed for use with unleaded. Who knows if itll be alright

Thanks, what can go wrong.lol

No, they are not meant to be used with unleaded fuel. But you'll probably be okay. If the engine is out already though and you need to freshen it up before putting it in the 1974, you might as well take the heads off and have the heads cleaned up and new valves put in it.

No, they aren't hardened, but mid grade unleaded should work, I use it in my 66 Mustang with 9.5 compression.

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