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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 2013 Posts: 1,518 'Bolter | | 'Bolter Joined: Jan 2013 Posts: 1,518 | I have a 53 truck with a 235 engine from a 56 in her. I kept the original 216 flywheel and clutch and bellhousing on her. I understand that the 235 runs with more initial advance but was thinking about 5 degrees is that right? So if I set the initial with the vacuum line plugged off the distributor, and line up the dots on the flywheel/bellhousing then after set -lock it down then add 5 degrees advance to the octane adjustment. Is this right?
1953 Chevrolet 3100261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done In the DITY GalleryVideo of the 261 running1964 GMC 1000305 Big Block V6, sm420, the next cab off restoration
| | | | | Joined: Mar 2010 Posts: 10,272 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,272 | No need to do anything with the vacuum advance. It is totally out of the picture at idle.
I see no reason why using the octane selector as you have described would not work to add 5 degrees of timing.
After you do that, take it for a drive and listen for a ping when the engine is under load. Driving in 3rd gear when you should be in 2nd gear will do that if your timing is retarded. You want to advance the timing just a smidge higher than what causes a ping under load. Too much advance will kill your performance. It won't ping, but it will be a dog.
Carl
Last edited by 52Carl; 10/01/2017 2:45 AM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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