hej,messed with mine bought in 97 the other day.its got 27 degrees mech advance.as a bonus i can tell you that the vacuum can can be adjusted between 6-17"inches of jadajada,it is between those nr of hg"vacuum it starts to add the extra advance.dont know if my vacuum meter is accurate but the mech advance ive checked with 3 timing lights and if i remember right they where pretty close to each other,my 25 year old BILTEMA timing light red the same as my also old back-dial snap-on. this is off off a bb mp distributor.