I drilled too deep removing a snapped off bolt in the timing cover on my 5.7 vortec! 2nd bolt down on the right just under the water pump.cover is on now but coolant leaks out around the bolt head.thought it had to be leaking from the water pump gasket until I pulled the timing cover bolt just to see and coolant poured out the hole! What do I do now,just cram some j b.weld in the hole with the bolt and hope for the best? Or is there a better solution?