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Both the AVL and cast iron Bullet cams run on 5/8" O/D spindles, which is around 15.88mm, and a round 15.88mm if you're really lucky! Retro-fitting Bullet cams to an AVL is an option, but probably not for a UCE/EFI, as the gear tooth shape seems to have been changed, and as the UCE crank pinion is machined as part of the timing side shaft you can't do a wholesale cam and pinion swap.The adjustable cam spindle thing was, I believe, an attempt by the factory to cut down on timing gear rattle, but it is of course something else to work loose and go out of adjustment. My AVL hybrid engine happily uses the old solid spindles - theses engines will never be totally silent mechanically.A.
38 tooth Cam gear on the UCE's.... 36 on the AVL's and Iron barrels ?
The bushings inside those cam gears... over time and miles... will take on the shape of those eccentric spindles. So the gear teeth will mesh tighter and looser from one side of the gear to the other. This is why the recommend readjusting the gear lash in the book after a certain amount of miles.
The cams from the UCE engines are inaccurate in all dimensions.It is rare to find 2 the same.... A little noise from a 535 single ?