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If anything, the exhaust side studs are most susceptible to environmental corrosion. The other fasteners aren't as much; the head to cam housing studs, not at all.
If the exhaust studs are in good shape, leave them, then use anti-seize on them when assembling the engine. Many aren't in good shape. It's easier to R&R them once off the engine. Use steel, zinc or CAD plated if possible.
Sherwood
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