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7 members (Jon G, Wayne67vert, KEVINSKI, 50Chevy3100, 1955 1 Series, sron48, 1 invisible),
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Global Mod,
Mod | | | Forums66 Topics128,012 Posts1,055,311 Members48,419 | | 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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| | | | Joined: May 2002 Posts: 23 'Bolter | | 'Bolter Joined: May 2002 Posts: 23 | Hey guys,
I'm changing my vacuum advance and need to know the correct timing. I looked up several topics and one said 4 degrees ATDC and that didn't sound right. What is the timing on a 54 235 chevy. Thanks, Pilot | | | 
#7859 03/20/2003 11:49 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Line it up with the ball on the flywheel, it's 5* btdc if I remember right.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | | | | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | You can give it 5 to 10 degrees BTDC. The old-timers say that if you can 'bump' the key and she fires, the timing is right.
chip
Preaching the Hot Rod Gospel according to the 4-stroke apostles:
Suck, Squish, Fire and Fumes
| | | | | Joined: Jan 2001 Posts: 230 Shop Shark | | Shop Shark Joined: Jan 2001 Posts: 230 | To directly answer your question , the is a small window just above the starter , it has a tiny pointer hanging down and when the engine is idling , you'll see a ball bearing pressed into a hole on the flywheel , line it up with the pointer
and you're good to go . you might consider removing the flywheel splash pan and marking the ball bearing with a circle of white paint as it is hard to see , use the wifey-poo's nail polish ,
it'll last forever .
There should be _no_ vacuum at the advance hose when the engine is at idle ! .
-Nate
There is no problem so difficult it cannot be overcome by generous application of brute force & ignorance
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