...I have never, EVER seen an "original" one with Gloss Medium Machine Gray or "Ford Gray" like 99.99999% of the guys use!
You make a good point, but years & years of dirt, oil, & grease might have darkened those "original" engines up just a tad. The only original one I've ever seen was what I'd call "Battleship Gray"...
The OP is going to have one heck of a researched & documented webpage background color! (just a reminder for why this is getting discussed again)
Brad
Edit- And...don't read my post wrong--I like the discussion!