Kaan W Posted June 11, 2013 Share Posted June 11, 2013 All I can think of is the black bolt may have a slightly larger and better defined shoulder at the root of the threads under the bolt head, to accurately position the flex plate over the other holes. As I said, I have two engines with auto boxes in bits and both parts bins for the two engines have all black bolts, and neither have been dismantled before. I wouldn't worry about it if it's already together. Same. One set from the old converter and one set from the new, all black. Quote Link to comment Share on other sites More sharing options...
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