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Looking for some input on the old 150. It appears a prior owner had the exhaust manifold off at some point; I think. I have several bolts that have come loose; I gently tighten them because it feels as if they don't get tight enough and i'll damage the block's threads. I actually had a bolt come out with pieces of aluminum from the block in between the threads. Is this a matter of going to a slighter larger size of bolts and retapping the holes? I am getting some minor leaks as a result of these bolts. Thanks!