Karl,
No. 531395 heads were used on all 1959 engines. Valve size will be 1.88 int and 1.60 Ex.
If the head was used on a 10.5 CR. engine, a stamped "X" appeared just to the left of the center exhaust bolt hole. If HD valve springs were used (420 A), a "0" was stamped to the right.
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