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Labor Day Putting down your wrenches or time for MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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| | | Forums66 Topics128,004 Posts1,055,265 Members48,418 | | Most Online14,466 Apr 26th, 2026 | | AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Aug 2005 Posts: 1,186 Shop Shark | | Shop Shark Joined: Aug 2005 Posts: 1,186 | if you want to advance 5 degrees set the dial to 5 advanced then point at timing light and you should see pointer on ball. OK, the book says for the 261 it should be 5 degrees BTDC. How do I do that with the timing light I have? I don't fully understand the BTDC and ATDC as it relates to my vintage POS light. Also I didn't have a vacuum gauge but just bought one like yours off ebay for under $20. So once I get the gauge, what is the vacuum I'm looking for at idle? I'm pretty sure the advance is working but I'll go check it right now. I'll also check the valves.
Bruce
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