hi there again, Don't use ultra blue sealant or silicon.
I only use gasket cement 3 pond or the Holden head stud sealant in a small can. Repco sell it put it is a little pricey but will last a lift time if stored properly. It's yellow 3 bond and the holden stuff a little lighter. Remember every time you boil the engine the scale will transfer into the rh radiator tank. Steam is the best cleaner.
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