G.T.O.boy, I try never to say never but I have yet to see a '64 PHS record that did not identify the installed tire from any of the 4 Plants. Some of the Fremont docs were very poorly copied to microfiche so the copy you get from PHS may be barely legible. Most are legible for the typed info even if the preprinted form box labels are "missing".
For a Fremont record, there will be a box in the 2nd line labeled TIRES.
For a GTO, one of two choices will show.
75014RSW will indicate the build got the Red Lines.
If it shows 75014W2R instead, that will indicate the build got the Whitewalls, a no cost GTO choice. It is not clear how the choice was made but a large number of '64 GTOs were built with them from all 4 Plants.
At Fremont, if the GTO got Whitewalll, you will see an option listed for them as well. The options were listed alphabetically by UPC and will show:
P30 WHT W TIRE OVR
which translates as the UPC P30 Whitewall Tire Over-Ride,
The KC & Balt docs also showed the tire choice by two means. 2 digit numeric coding using boxes 35 & 36 plus the alpha coding in the TIRE CODE box toward the bottom of the form. The 1st letter was for the size (F was 7.50x14) and the 2nd letter was the sidewall type (R was Red Line, Y or Z was Whitewall).
The Pontiac doc only coded the Tires in the Boxes 72 & 73 (labeled TIRE TYPE) using numeric coding. 06 was the 7.50x14 Whitewalls and 07 was the 7.50x14 Red Lines.
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