69 Z28 Timing

[Steve Shauger]

[ QUOTE ]
If jerry set the distributor up he curved it. There should be a paper that came with it telling where to set the distributor up at idle and where it should be at around 2800 rpm's. probably 12-14 degrees at idle. No vacuum advance is necessary with jerry's set-up.

[/ QUOTE ]

The main function of vacuum advance is during lean conditions, such as highway driving, fuel takes longer to burn, and by starting the burn cycle earlier (via vacuum advance) you get a more complete burn and increase effiency. Its probably a good idea to use on street engines.