Residual magnitism in T engines?

[dumb person]

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So for a science experiment i wanted some iron filings but there is no source of pure iron anymore. Only steel which retains its magnetism. i know the crankshafts become magnetized from the flywheel but does the block too? i do not have one handy to measure, and only have a compass for guidance.
If cast iron does not retain magnetism (i suspect it may?) then i cannot use it as a source for this experiment.

Which makes me wonder, if you have a jar of ferrofluid please place it on a model T transmission and turn the engine over (possibly while it is running?) and video the results if it looks interesting. Thankyou.