I do not believe that it is stock. I think they used a rivet there which is prone to wear, which is likely the reason that it was replaced with a screw.
Last edited by 52Carl; 05/13/202411:32 PM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
When you look up a vacuum advance it shows two different styles. One with hole and one with a keyed stud for lack of better words. How does the one with the hole mount?
Last edited by Peggy M; 05/14/202412:07 AM. Reason: add a little more helpful info :)
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
Now that you mention it, I have seen those shouldered bolts before. They also are prone to wear out causing a lot of slop. The '53 235 I am currently running does not have that shoulder bolts and nut arrangement. Looking at breezy's pic, his bolt doesn't look right to me. It may well be, but he needs to check to see if it has a shoulder on it which fits properly in the sheet metal hole without a lot of slop.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
Breezy, what year are you working on there. That looks like the vacuum advance on my '50 216, and that screw with the shoulder is correct. I ran into the same issue (slop from wear). I ended up finding another distributor that had a good screw with little/no wear----after I had ordered a shoulder screw from McMaster-Carr. Don't remember the specs on the screw, but I "think" that it is as Bill described earlier.
Last edited by Phak1; 05/16/202411:38 AM. Reason: Spelling
Working on 57 235. But who knows where the distributor came from it was in the motor. Picture is just one I found on the internet. Mine just had a wood screw in it. Just trying to make it correct. After taking apart I figured out it had the key shaped hole so ordered vacuum advance with the key shaped stud. Should all be good once it shows up.
I would assume (we all know what that does) that the distributor/advance pair are period correct for that engine. I do know that at some point after the 216, the advance setup was changed.
