Timing Advance Sanity Check

Measure the length of the timing advance slots... If they measure around .428 you timing light is suspect... If they measure .340-.350 somebody may have modified them... Honestly less mechanical allows you to add more base timing which generally helps with low rpm drivability...

6 deg 12 0.340
7 deg 14 0.357
8 deg 16 0.375
9 deg 18 0.390
10 deg 20 0.405
11 deg 22 0.420
12 deg 24 0.435
13 deg 26 0.447
14 deg 28 0.460
15 deg 30 0.475
16 deg 32 0.490
17 deg 34 0.505
18 deg 36 0.520