The bottom head studs are leaking up through the threads. GAAA-RUN-TEE. Studs are only supposed to be "hand tight" in the block, but ya gotta use GOOD sealer on the threads. Had the same damn thing happen to me when we thrased all night to get ready for Fun Ford last year. Worked on the car until 6:00 AM, got 1 hour sleep, drove for 2, unloaded the car, and you guessed it. So we drank all weekend instead.
Anyways, got off topic there. I'll bet ya a donut that's your problem!
