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The lower bolts pass through the coolant passages. Use a thread chaser to clean up the threads and put some white permatex with teflon on the bolt threads. Clean the bolt threads first if you are reusing them. Personally, i would use ARP replacements. Dont forget to reinstall the cylinder head dowels if they pulled out.
 

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I use black ultra rtv on just the short outer bolts, make sure threads are clean and dry or the sealant wont work. I spray with brake clean beforehand to make sure they are clean.
 
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