OK guys... I just got in and read your post... but here is what I was just looked at in the garage.
I also have a 62 Impala with a 235 which runs great ... so I compared the timing advance looking at it with the timing light... just watching the mark move with the RPM.
The 235 looks about the same as my nova (230) but when the nova vacuum advance is disconnected (only has centrifical advance). I would say 8 deg advance with 1500 RPM or so. When the nova (230) has the vacuum advance connected, it advances alot more... maybe 15 or 20 degrees and runs bad! I have tried every port on the carb. I even tried it strait to manifold with it would barely idle with that setup.
So I think some how?? The vacuum advance is advancing to much. Anyone have a feel for how much advance is normal? I know I may still have issues with the 2 low cyl's... but it runs too well without vacuum advance and not ready to tear into it yet.
Thanks, Clyde
