With all the recent L4 timing gear items, I've put up the preliminary copy of the gear change info I have here....
http://theogre.home.sprynet.com/tunnel6/l4cam.htm WARNING! This document is not finished. It is not linked to the index. You can only get to it thru the above link. It may only be a temporary file until I get to the final version.
There's a large amount of stuff in there that isn't tested. Untill I can obtain a cam with a gear on it, I can't test it. (I don't even need a whole cam, just enough to clamp in a vise.)
The document does explain GM's specs to drill a pressing hole in the cam. Follow them. If that hole is the wrong size then you could cause the cam to break or strip the hole pressing the gear. (If you don't have an 8mm drill, use whatever SAE bit the tap specifies.)
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11-Sept-01, The day the world as we knew it ended.