This from Mike Summa for #TBT:

For TBT-This was Engine 812 in the North Palos FPD.  It looks to be a 1980’s Chevy/FMC.  Sorry, no specs.  If anyone knows any thing about this please feel free to respond.  Enjoy and thanks.
Mike Summa
#chicagoareafire.com; #MikeSumma; #FireTruck; #TBT; #FMC; #NorthPalosFPD; #historic; #Vintage;

Mike Summa photo