likely they didn't make a different badge "S" for the limited number of buses built, just had the one series badge

"S" = school bus, "60" is the series - you have an S62 or S64 model .... with the 327

see the 1964 GM resto pak in Tims link, which has lots of info on your bus model, will be the same for 65/66

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics