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Discussion Starter · #1 ·
Hi,

I would like to restore the engine compartment of my '77 Cadillac. I am trying to find out what the blue coating is on some of the bolts found on the rad support and fenders (not engine bolts).

I am told the blue coating denotes a metric bolt but no one seems to know what the coating is.

Thanks, Shayne.
 

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Discussion Starter · #3 ·
Hi HK,

You mean the bolts just have paint on them? It looks like a coating because the whole bolt is coated not just the head.

The reason being is I want it correct under the hood.

Shayne.
 
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