Trying to remember back to 64 or 65 I think the bolts had some kind of shiney silver plating but maybe not chrome. Although t would be hard to do a good job of polishing chrome on a bolt head like that. But the problem I ran into with mine was that in tightening enough to try to stop leaks I caused leaks. The integral washer on the bolt would gouge into the slight radius where the flange was stamped out from the vertical portion of the cover. That caused a slight tearing at that radius under the bolt/washer with a resulting leak. It was like the integral washer was slightly too big or the hole on the cover was a little too close to the vertical portion of the cover.
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