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Old 07-06-2002, 04:59 PM
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Question Timing is everything!

Man am I frustrated!!
I'm having trouble getting my ingnition timing right. Its basically a stock 67' 327 SBC, 350 turbo trans, Edelbrock carb, and HEI distributor, iron intake manifold.

Today it started up great and I drove out to a friends house. When I got off the freeway and started down local streets it started spitting and sputtering as soon as I give it gas while in gear. Sometimes it would stall or bang off a pretty impressive back fire. It revs great when in neutral or park or when cruising at about 40mph. I disconnected the vacuum advance hose to the distributor and that made the car driveable which was pretty important seeing how I was about 40 miles from home.

The car wont start unless its set at around 30deg BTDC and then it pings pretty bad, but at least it starts & runs. When I set it up for 12deg BTDC it just cranks and cranks but wont start.

I replaced the electronic module in the distributor, inspected and lubed all of the weights and springs.

1. Could the vacuum advance system be the problem?
2. Could the HEI weight springs be too weak?
3. What is the proper timing setting for this car?

Heat problem?, Plugs?, wires?, messed up vacuum signals from the carb?


I've spent hours & hours on this. Its time to ask the experts. <img src="confused.gif" border="0">

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Old 07-06-2002, 05:40 PM
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Sounds like the vacuum advance hose is connected to a full time vacuum source instead of ported vacuum, check them.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”

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Old 07-07-2002, 05:00 AM
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I thought that too so I threw a vacuum gage on the port I'm using and it only gives the vacuum signal when the throttle plate begins to open. like it should. The other port on the carb has full time vacuum.

Why do you think the timing wants to be so far advanced? I think the problem could be that the thing is advanced so far that when it gets its vacuum advance signal its just too much to take.

I'm still confused.

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