If that’s a flash copper plating I can’t think of any reason for them to only be used in 3 out of the 6 bolt holes that pass near exh ports.
Now the studded one can be seen to be used possibly for producing a better ground connection on the studded end and then also by the threads in the block.
Conversely the copper if originally was on all the bolts might have been used in place of any lube .
At this point in time we may never know the true intentions for this interesting detail.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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