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I do not think that there was a HD version of the 22F. From what I read in the 67 option list the HD battery up grade in a small block was the 24F.Here is how it reads. BATTERY - HEAVY DUTY - 55 Amp. (Standard on 390 V-8 with C-O-M) ............$7.44I do not know what C-O-M stands for.Both our 67 GTA C code and our 68 GT350 have the HD battery on their option lists. Both have a 24F and would have had 22Fs.
This is from a 67 electrical assembly manual there is no date on the page.
I found this battery in a 1967 Mercury Station wagon in a junkyard a few years ago. The front end had been damaged and the hood could not be opened. The junkyard has cars back to the 30's. I was able through persistance to get the hood open and remove the battery. The junkyard owner was surprised to see it. There is a crack in one corner and the finish has suffered from over 50 years of sitting there. I posted this on the SAAC forum and folks there (many of whom are also on this site) think it is an assembly line battery.My current questions relate to what sticker it might have had on it and if any of the lettering was colored. Information I have read here tells me the battery would not have had a date punch sticker.The white fluid highlighting the markings is just Armorall right after being sprayed. It wiped off nicely, but shows the markings very well.