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Timing/Vacuum Troubles

New User
Posts: 28
Joined: 01/08
Posted: 11/04/13 02:11 PM

I’m trying to figure out what’s going on with my timing and vacuum on  a 71 302 that I dropped into my 66 couple.  I’ve played with the timing between 6BTD and 12BTD to see if the car ran better but there was no noticeable change. This weekend I put a vacuum gauge on it and found that I’m only running 10in of vacuum, which I know is too low. I checked for vacuum leaks with both propane and starter fluid around the carb and manifold but didn’t find anything. So next I started retarting the time until I got the most vacuum which is 15in., but now my timing is at 49BTD which seems very odd but the car still running good. I’m hoping someone has an idea.
I installed the timing chain while the engine was on a stand so I’d be surprised if I was off a tooth. I’ve also verified TDC.
Engine Description
• Stock pistons
• Edelbrock RPM cam
• Edelbrock RPM dual plain manifold
• Edelbrock 500 cfm carb
• Headers
• MSD A6 ignition box w/distributor
• Edelbrock timing chain  

Post Reply
Posts: 86
Joined: 07/13
Posted: 11/06/13 12:59 AM


your timing is not at 49, there is an error. as long as it runs good where it is at and starts, turns off good and does not ping on acceleration nit is fine.  

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