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Old 02-02-2012, 04:30 PM
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1971BB427 1971BB427 is offline
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I'd guess what caused the bolt to seize was it had no thread sealant on it when assembled and the threads go into the water jacket. I've had them snap off nearly flush, but they don't take much to get out once the head is off.
I keep a set of lefthand drill bits just for these scenarios. Drilling the broken remaining bolt progressively larger with a LH bit does a good job, and when the hole is large enough the bit usually catches it and turns it right out without an easyout.
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