Are there any opinions as to what NOT to use. It was suggested that I not use brass. I'm setting up a two tank system to start & stop with diesel, & run on WVO. I was planning on running brass from the WVO tank to the change over valve, but told there could be a problem. I don't know what the problem is supposed to be.
    Rod

            I think I've got a cracked head, I mean I know I do, but I think my Listeroid does also. I'm going to get some pictures now. I've yet to master "Coppermine", so if anyone would be kind enough to offer opinion I'll e-mail the pictures to you for a look. Last night the power went off so we had our first need to run the engine. I've been running it as I built the set-up with no problems with the exception of black water (very little) running down one exhaust header. I figured it was the head gasket, due to not changing it after inspection. Last night was the longest run, I have two thermometers on it, water out and water back in. The idea being to prove the cooling system adequate, and it was. So this morning I decided to change the head gasket, I ordered extras with the engine, only to find a crack. The wife says she saw it during the inspection and that I said it was a scratch.
           I was a line mechanic in two new car dealerships, a total of 5 years. In my opinion this should be warranty, if it's a crack. By the way, there's no carbon around the "scratch"           HELP  Rod