Would anyone know a mail order company that sells engine paint? I am looking for about 8 oz that I can thin and touch up my motor with an air brush and I can't find any in the paint supply stores. Eastwood only sells rattle cans as do the paint stores.

Mark,
Pick up a copy of Hemmings Motor News, I am pretty certain there are a couple of vendors in there that sell it.

That being said .......

I would just have you local paint store mix you some regular automotive paint to match your color. Engine blocks really do not get hot enough to worry about using a high heat paint. I know of many that are painted with normal base coat / clear coat paints and look good 10 years later. The few hot spots, like at the intake heat crossover, will cause a problem with almost any type of paint.
Hope this helps,

Just take your spray can and blow a puddle of paint in the plastic cap. Now just pour it into your air brush cup and paint. Should be about the right consistency or add lacquer thinner as required.

Thanks for the replies, tried the spray can in a cup thing and it didn't work out too well. I'll try the regular paint.