Gonna be a big weekend--- Found a Deluxe heater core at my local hometown Independent owner parts house in stock!!! on the shelf!!! It was upstairs in the way back area in a very dusty box. It took the counter guy about 10 minutes to find it but I was Impressed !!!
I bought the Deluxe core which is bigger than the Thrift-air core cause it looked to me like it would fit in the heater box with a little trimming and I wanted all the heat I could get!
The Deluxe Core is 9 -1/2"X 6 -3/8" X 2 -1/2" The Thrift air core is 7- 1/4" X 6- 3/8" X 2 -1/2 "
The piece that needs to be removed for the bigger core is already Indented on the aluminum heater box lid and will be machined out.
The Thrift Air Heater uses all outside air with no recirculation