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What is the correct factory finish on the nuts/bolts used to attach the motor to the K member through the engine mounts?

Thought it was black phosphate, but have seem some that appear to be zinc.

If it makes a difference talking about BB 1969.

Thanks

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The Long "38" bolts are silver cad. The nuts can vary from silver cad or zinc phosohate. The washers are usually silver cad or silver zinc.
Not much on a Mopar is black phos.

Here is the original hardware on a 69 440. The silver cad has worn off of the treads on the short bolts but is still clearly evident on the head. Every car that Chrysler made had motor mount hardware (100's of thousands of bolts) so you can expect some vendor variance here and there.....I am just reporting what I have seen for years and what is on my original stuff.

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