[GerhardH]

Today more investigation regarding timing.

First of all I believe that this distributor have no advanced stop pin and advance stop bushing by construction (stop is simply end of slot). Correction: No additional adfvance stop button, just the two main in the slots without bushings).

Second I believe that this distributor have not any kind of plastic wear buttons (the weights ride on the center plate directly).

Third I believe that the weights have a little bit of wear, but not serious, more or less still round.

Fourth I believe that the springs are absolutly to strong, see also measurements.

Measurement with vacuum pump on the vacuum advance canister:

Target:
AR23
START 5-7 inHg,
Max. advance distributor degree 7.5° (15 crank degree) , Max inHg 11-12.5.

Measured (initial timing is 10 crank degree)

07@10 7 inHg @ 10 crank degree
08@13
09@16
10@19
11@20
12@24
13@24
14@24
15@24

Means measurement meets target/specification.

Initial advance

Found out that I cannot advance more than 10° crank because the advance canister collide with the carburetor, have to change the plug wires on the distributor by 1 and check/adjust again. (By the way you need a 9/16 spanner)

Mechanical (centrifugal) advance. (vacuum advanced plugged)

Removed springs test advance = 50 crank degree at idle (as initial is 10 crank degree the distributor is able to advance by max. 40 degree), putted back the springs:

10@ 900
10@1000
11@1500
13@2000
14@2500
15@3000
16@3200

this is definitly not enough, wrong springs/weights what else need more material and investigation-