[Mr. G]

Had the upper long bolt on passenger side break off at the pump surface after getting one turn on it. Attempting to remove timing cove to replace the broken bolt but the bolt is corroded solid inside the timing cover hole. Put a puller on it and it and the cover won't budge off the broken bolt. Any good tricks to get this loose? Trying not to destroy the timing cover in the process. Been working on these cars for 45 years and have never had this problem before but I do understand the dissimilar metals issue going on here. Bolt turns in the block just not in the timing cover. this is on an 11 bolt cover.