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My 1983 Evinrude 40 hp has a leak from the cooling jacket gasket. So I pulled the powerhead to change the gasket. Anyway I guess the 26 yrs froze some bolts and 4 were broken (which explains why the motor was shaking the last time I used it). I think they are stainless. Can these be drilled out by a rookie or does a machine shop need to do it? Also there are two hair line cracks on the exhaust wall on the block. can these be welded? It is aluminum. The engine is worth less than $1000. WHat does it cost to get broken bolts removed from a shop?