Aluminum heads
I have three 21 stud aluminum heads. Two(r & l) have the ford logo cast
onto them; one has only a faint part number while the other has sharp detail
and the word ALUMINUM plus 6.32-1.
The third head(L) has only the part number(faint) and on the bottom,below the
water outlet is 21A.
Do these variations identify different years and/or outside vendors ???
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