too much advance timing

[bryan goulet]

i cant get my car to time right. i set the initial timing at 10 advance. then when i reconect the vaccum line it jumps right to 45 total timing. what could be the cause of this, and how can i fix it?
i know i should be running about 36 advance.
any help would be nice. thanks

[Henry Rifle]

Sounds like you may have the vacuum line attached to manifold vacuum (below the throttle plates) instead of ported vacuum (above the throttle plates).

Read this article:

http://www.chevyhiperformance.com/howto/97438/