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Old 10-07-2015, 06:40 PM   #21
RyansToy
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Join Date: Aug 2015
Location: Nova Scotia Canada
Posts: 145
Re: Tuning carb with a Vacuum Gauge

So on Monday I talked to a chevy mechanic dude... older guy use to the carbs. We set up tonight to have a look at the truck.

I was reasonably happy with the truck prior to going, the gapped plugs really made it much nicer. Brought him a case of beer and offered some money...

15 minutes later he adjusted the distributor without the timing light, asked me to restart the engine. Started easily. Ran well. Went for a drive. It was perfect....

So when I got home, I looked at the timing with the light. The advance (vac blocked) is way off the markings. I estimate the timing to be around 16-20 degrees advance.

Can't complain, but i really wish I understood the process.

He didn't take any money...
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1968 GMC truck
910 Trim (Canadian)
127" WB
3 on the Three Trans (Saginaw SM330)
250 ci L6 Engine
HEI ignition (early 80s L6)
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