Here's a picture of the heater assembly I'm using. This is a copper/brass core, approx. 6"x 8" x 2-1/2", mounted in a steel box with a single air inlet on one side and dual outlets on the other. This one was built by David at Desert Hybrids here in Tucson. Since he already had a nice powdercoated box and core put together, I decided to buy it from him rather than taking time to fabricate one myself. I don't know the exact core he used, but it looks very similar to Nissan p/n 27141-01P00 used in the 80's 300ZX. Here I have soldered on the copper tubing and fittings for connecting the hoses.
