Hayden 2947, Thermal drive.
View attachment 1716163536
View attachment 1716163537
edited my earlier post again.
Found this:
If my notes are correct, the Hayden catalog showed.
1968-73 340 => 2707 thermal, 17107 non-thermal, 2747 Heavy duty
1968-73 318 => 2706 thermal, 1706 non-therrmal, 2747 Heavy Duty
