I should have been more exact in my comment. The lead additives in gas back then was actually Tetraethyl lead (THL) a compound that prevented the buildup of damaging lead oxides In engines.
To manufacture THL only feeds were found to be cost, Bromides and chlorides. Bromide turned out to be most effective for the specific needs of aviation fuel and chlorides for automotive fuels. Both these feed materials are the root cause of the corrosive nature of leaded fuels.
I’ve noticed on single exhaust cars a telltale of that corrosive effect. The pot-metal tail light bezels corrode much worse on the tailpipe side.
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My Break Away Squad
1969 Fbird (base OHC, 350, 400HO & Sprint Cvt’s - 400HO & TA ht’s)
1969 Custom S 2dr ht
1969 LeMans (2dr & 4dr ht & Cvt)
1969 LeMans Safari wagon
1969 GTO (2 Cvt, 2 ht & Judge ht)
1969 Cat (3 Cvt’s & a 2dr ht)
1969 Ventura wagon 2 seat
1969 Exec 4dr post
1969 2 Bonnie Cvt's & 2 wagons
1969 Bonnie Brougham (4dr ht & Cvt)
1969 Grand Prix 2 SJ’s
1969 2+2 2dr ht (Canadian)
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