Are all 100 series fors timing covers cast aluminum?

I went to remove the governor from my parts
tractor 641 and most of the upper bolts broke through
the aluminum cover. Acted like some form of oxidation
was then cause. Is this common?
 
I've never seen that happen, but understand how it could. Every Red Tiger timing cover I've seen has been aluminum.
I have an extra one, if you need one.
 
(quoted from post at 16:02:04 06/22/18) I've never seen that happen, but understand how it could. Every Red Tiger timing cover I've seen has been aluminum.
I have an extra one, if you need one.

Thanks for the offer. I will be using the governor to
replace the defective one in my 641.
And since it has been in service for most
of its life I am hoping when I remover the cover
it turns out ok.

I have seen a similar aluminum turning to powder in
an aluminum radiator shell in my 26 chevy.
mvphoto18654.jpg
 

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