I have found .050"-.070" on N.O.S. units.
Remember, up&down play is NO issue due to the helical gears pushing the distibutor gear against the wear shim at all times the engine is running.
Itīs NOT like the shaft moves up&down with engine running.
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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