Vintage Gulf Oil Co. 746-641 Engine Block Heater, 1950's-70's Gm,ford,mercury on 2040-parts.com

For auction is a vintage,unused Gulf engine block heater,rated for 600 watts @ 110-120 volts. It fits 1968-77 Cadillacs 472 & 500 cu.in. and 1958 -77 Ford/Mercury engines including 170,200,250,330,352,360,361,390 391,401,410,427,428,477,534 cu.in. 6 & 8 cyl. engines.  "PLEASE NOTE; The exceptions being it will not fit  1958-68 Lincoln Mark III & IV 460 cu.in. or the Canadian Made 427,428,429 cu.in. from 1964 on". The heater and power cord look to be in good condition,other than some light storage soiling and darkening of the metel. The box and instructions/application chart is included (the box being complete,but poor condition). This may fit newer model engines (?) but was made in 1977,so the application list only goes up to 1977. I have not plugged it in to test it,because the heating element needs to be in water/coolant,so it is being sold as-is.