Timing problem - Team Camaro Tech
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post #1 of 2 (permalink) Old Apr 26th, 01, 10:04 AM Thread Starter
Join Date: Feb 2000
Posts: 101

I have an Accel HEI in my 68 Camaro 350 motor and I had a bad vacuum advance so I swapped it out. I had 14 degrees initial timing before I changed it with the vacuum plugged, and now I am right at TDC after changing it with vacuum plugged. How is that possible?? The distributor clamp is tight so I know that the distributor did not turn. Any ideas?? This has happened twice now, both times after pulling the vacuum unit out and reinstalling.
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post #2 of 2 (permalink) Old Apr 26th, 01, 10:57 AM
Senior Tech
Join Date: Dec 2000
Location: Monroe, WA, USA
Posts: 312

sound's like the old vacuum advance was hung and it left the advance part of the carb about 14* advanced. after you swaped in the new unit, you retarded the advance part and your base timing went lower.

plug the vacuum advance into the manifold vacuum and see if your timing come's up, this is a great way to see if it work's too, then unplug it and see where it is at. if it is back where it was when you started, set the base timing and go and have fun! if it is diferant i bet you might need to do some work to fix your distributor.

[This message has been edited by ilbl8 (edited 04-26-2001).]
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