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Old 01-12-2005, 09:33 AM
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1968 Mustang Timing

Hello Im new here I have a question I hope somebody can answer MY car was running very good but I put a timing light on it and it was runing about 30 degrees advanced so Looked up manufacture specs 6 degrees advanced so I moved it to 6 degrees and took it for a test drive and It feels like I lost 50 hP
can anybody tell me what I should do

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Old 01-12-2005, 09:49 AM
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Initial advance, factory recommended is 6 degrees. Im thinking what you did was retarded it to 6 degrees total.
Disconnect your vacuum line from the carb to the distributor and plug it, leaving the vacuum line connected to the carb.

With your engine at idle, set the timing at 6 degrees.
I would recommend going to 10 degrees initial advance, as you will see a big gain in power just from that.

After you have set the initial advance, and locked the distributor down, reconnect your vacuum line.

I am curious where you had the vacuum advance connected. If you had it connected to a vacuum manifold on the back of the intake, you are hooked in the wrong place. There is a metered port on the right side of the carb to connect your distributor vacuum.

You will notice that when you reconnect your vacuum line to the distributor, that your timing will increase significantly. That is what its supposed to do. Your vacuum advance only affects the engine at idle and cruising rpm. When you step down on the throttle, your vacuum signal drops off, allowing the distributor to drop back to your initial advance, plus the centrifical advance being made by the counter weights.
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Old 01-12-2005, 09:52 AM
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Its possible that you were on the wrong plug with the light.

Its possible that the advance weights are stuck in the full advanced position.

Its possible that the vacuum advance is stuck in the full advanced position.

Its possible that the harmonic balancer outer ring has slipped and is not indexed properly anymore.

First, make sure you are on number 1 plug. If you are, remove the cap and see if the rotor can be turned back and forth. It should move about 3/8" and then spring back. If not, the weights are stuck. Maybe a cleaning or may be time for a new dist.

While the cap is off, put a piece of vacuum hose on the advance and suck on it, you should see the points plate move, then move back when you release suction on the hose. If it does not move, replace it.

If the above three check out, you'll need to remove number 1 plug and get the piston to exact top dead compression and then check the timing mark to balancer marks. Timing mark on the balancer should line up with 0 on the balancer.

Its also a good idea to check the point gap BEFORE setting the timing. Gap should be about .018 or 30degrees of dwell on a meter.
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