Is there a list somewhere of which under hood / engine compartment parts came from the factory originally with the yellow cad plating?  I have tried searching, but have not been able to find a comprehensive list.  Thanks.

Look for a thread by careless. He has done a very thorough restoration and covered most of this in his thread. There is not a comprehensive list anywhere that I know of...

I'll give it a try.  Thanks.

3 hours ago, davez54 said:

Is there a list somewhere of which under hood / engine compartment parts came from the factory originally with the yellow cad plating?

The answer is that none were. The finish you are thinking of is (yellow) gold-passivated Zinc Chromate plating.

I could be wrong, but gold-passivated zinc chromate plating may be what they do now since cad plating has been illegal for years.  I believe it would have been cadmium plating back in 1971, but there are alternatives now that are less toxic to the environment.,

1 hour ago, davez54 said:

I could be wrong, but gold-passivated zinc chromate plating may be what they do now since cad plating has been illegal for years.  I believe it would have been cadmium plating back in 1971, but there are alternatives now that are less toxic to the environment.,

No, there is Japanese factory documentation confirming that the majority of protective plating on the car was Zinc, and the yellow 'gold' finish is gold-passivated Zinc Chromate.

Whatever the coating was, I'm trying to determine what parts under the hood had it and which did not.

As Patcon has suggested, you should read the 'Careless' thread.  He seems to have been pretty diligent about maintaining originality.  I haven't seen an exhaustive list anywhere.  The topic pops up from time to time, gets a few comments, and then dies away until the next person asks.

The most visible non-'yellow zinc' parts that come to my mind are:

• Coil mounting bracket >> clear zinc
• Front and rear engine 'slingers' (the engine hoist loops that bolt to the front and rear of the cylinder head) >> clear zinc
• Fuel Filter mount bracket >> painted satin black
• Vacuum Check Valve mount bracket (firewall) >> painted satin black
• Ballast Resistor mount bracket >> clear zinc

I think that the wingnut-style bolts used to secure the air cleaner housing 'lid' were also clear-zinc, rather than yellow zinc.

It's my observation that most Z owners who restore their engine compartments and use a plating service just get everything done in yellow zinc.  Probably looks better than the factory's mish-mash anyway.  The yellow-green irridescent look is what you're after.