My friends and I tried to do a head swap over spring break... a d16z6 ported & polished head onto a d15b7 block. The car runs great, with the exception of it revs itself from 1500 to 1000 in idle, non-stop. I don't have the new computer yet, so that is what I've been told is the problem. Sound right? Now, it does run great.. but for a period about 4 minutes. From there it overheats! The car also seemed to be leaking coolant and oil, and it is burning a ton of coolant as is obvious by the constant stream of white smoke. Somehow we forgot to seal the copper head gasket, so we realized that was the problem. Yesterday my friend and I sealed the head gasket and re-sealed the others... ran great, then I reved it very lightly and it went back to ALL of its old ways. I took the spark plugs off this morning and there is a small amount of coolant on the first cylinder plug. I believe this is a new problem. Coolant is getting to the block, it was full when we took the head off. It isn't the temp gauge, as the engine is definately burning. We rigged the fan with a switch to keep it on constantly and that doesn't help at all. Any ideas would be greatly appreciated... we're stuck, and I'm starting to really worry about the car.