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This is interesting, we get our Jun gear direct from Japan and I have never had a problem. Maybe there are some copies floating around, however I will check the hardness of the next set of camshafts.

I believe that JUN do make some of their own gear. There was an article a while back in Zoom where they went to the JUN factory, and they had some shots of their rods being CNC'd from a block of billet. I do recall that their piston blanks are made by cosworth, but specially cast for JUN. ie, if you look at a JUN piston, it will have both "JUN" and "Cosworth" cast into it. Of course there's nothing to say that that isn't the only difference between normal Cosworths.

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