Seized crank case screws

Matt S /
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So the screws in my crank case feel like they're cemented in. I stripped the screws, don't have a good angle to dremel them into flatheads, and I tried my impact driver with no luck. I've put penetrating oil on the screws between each of these attempts over the last few days.

I drilled the screws and tried to use an extractor, also with no luck. Now I have 5 screws whose heads are just bored out holes.

I am thinking of taking the whole case over to a welding shop and having them weld some nuts onto the heads of each screw, and using a socket wrench with a cheater pipe to try this again. Do you think that will do the trick?

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