Wierd Coolant leak
 

First off I have 1988 non turbo supra. I was driving around yesterday, actually heading to a salvage yard to get some parts for my room mates 1993 Honda Civic. Just as I was pulling into the salvage yard steam from coolant started rolling out from under my hood. Well I got towed home, added some water to the engine & cranked it to try & find the leak. Ther was nothing, nada. I let the car idle to operating temp & still nothing. I had my brother rev the motor while I looked for the leak & still nothing.
When I was in the salvage yard parking lot I could see a trickle running down near the oil filter. But when I ran the car at home there was nothing. I know this sounds a little vague, but can anyone help shed some light on this? :(

check under the distributor theres a hose thats from the thermostat housing to the block...mine blew out last week...

Another possibility is a hole in the hard pipe which wraps around the block.

Thanks
 

Thanks for the replies. I was running the car today & did notice it coming from near the distributor. I will take it apart tomorrow. Once again, thanks guys.