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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!
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| | | | Joined: Jan 2009 Posts: 58 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2009 Posts: 58 | Need one of you seasoned stovebolters to to tell me how to check timing on my 1957 235 motor with vacuum advance. First crazy question, where is the timing marks? Just bought me a timing light from Sears and ready to check timing. Just put a new vacuum advance on (old one wasn't working). Also, if anyone can tell me what degree for normal and advance. I'm just learning this stuff so all details will be appreciated. thanks, ole skool trucks  | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The timing mark is on the flywheel. It's actually an imbedded steel ball. You time it from the right hand side of the engine through a veiw hole just above the starter on the bellhousing. You'll notice a pointer in the hole. Tip, paint the pointer white so you can see it easier.
According to the 1957 Truck Manual, the timing should be set at TDC with the advance disconnected and engine at idle speed.
Bill Burmeister
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