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All stock 289 2bl auto,133K, runs on today's reg, Tonight I pulled out the timing light. Car runs great, i dont here any ping. Of coarse i dont hear much anyways but I do have hearing aids so I should hear something, I hear the wife. Car starts without gas pedal after first start of day.
Vacuum disconnected and capped off this is what I got using a light with dwell ajust. when I got the light to 17 the mark was at TDC
17 deg at 750 rpm this seems hi for timing
34 deg at 2500 rpm this seems good
64 deg at 2500 with vacuum hooked up
I am not sure I did this all correct as it has been awhile since I pulled out the timing light, and not sure what it all means. I do know my SBC is at 10 deg and premium fuel
Please let me know if all is good or what I should do
Last edited by Cab4word67 (9/05/2019 10:04 PM)
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Whoh, thats way too much!
Base timing should be around 6 degrees without vac. Add about 10 with vac. That opens the door to the 30 additional degrees vac advance at 2500. There should be a small bushing where the vac advance connects to the advance plate in the distributor that limits the total advance All in at 3500 should be in the 35 degree range.
Now, its possible the rubber has slipped in the balancer, showing the wrong advance, or you are looking at the wrong mark, but either way, there is WAY too much vac included advance.
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I have a really expensive timing light that I don't use. It was a gift from a friend that dosent like the way I set timing. I use a vacuum gauge and set my timing for max vacuum at idle. Been doing this for years, a lot of years. Mines a 289 with Edelbrock Performer carb and manifold and mild cam. I tried the timing light, mostly because it's chrome plated and makes me look like I know what I'm doing but I couldn't make it run as good as it does using the vac gauge. By the way, I to have hearing aids thanks to the US Navy. Still can't hear the wife.
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High everyone,
Went in and drop the timing down to 6 deg with no vac. hooked up vac line and re set the idle to about 850 in neutral. Car runs great and dose not seem to be get crazy hot anymore.
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If it runs good......hey that's great! That's more than a bunch of us can say.
Did you have the vacuum hooked to the ported or un ported?
Was there vacuum UNTIL you open the throttle (then there would be NONE)
OR............vacuum all the time?
6s6
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There was no vac at idle when I caped it off. Again the car runs great now. And this is it is not over heating at idle, cruse or anywhere even wit the air on in 82 deg Oregon heat. Lol
I am going to check where total timing is and probably have to lower it a tad. We will see
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