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Old February 19th, 2016, 01:57 PM
abus319 abus319 is offline
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Join Date: Sep 2013
Location: Austin Texas
Truck: 1960 3500, 305D heads
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Default Re: Too much timing?

The vacuum advance issue has been puzzling me as well.
I checked the 478 with a hand operated pump before I fired it up, and found that it didn't start to operate until about 24 inches. That got me curious so I checked the 305's and found about the same thing. Basically they never operate.
I hope someone can shed some light on this
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