machined notch on distributor

pippo

Member
98
5
8
Florida
People,

My 1987 sunbird GT (2 door) has a distributor of course, and I always wondered why the factory cut (machined) a quite visible notch in both the distributor base as well as the distributor (outer end). Such that they could be lined up and perhaps take the guess work out of timing. Anyone know why they are there ?

Thanks, as always, People.
 

melsg5

Staff member
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not sure if the answer is buried in this thread
 

pippo

Member
98
5
8
Florida
Thanks, Mel. I forgot about that thread I started!! I guess from those replies my OBD 1 car can not get "timed" as computer takes over where ever one places the distributor. Thats how I interpret those replies/advice. I still dont understand why factory notched those cars. Am I the only one here that owns such a car?
 

melsg5

Staff member
SUSTAINING MEMBER
19,152
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48
To typically set timing you would disconnect the computer lead to the distributor, set the initial timing, and then replug the computer lead. A hot rod trick on 82 Corvettes is to follow that procedure but instead of setting the timing to the factory spec of 6 BTDC bump it up to 12 BTDC. That usually requires a shift to a higher octane gasoline such as 89 or 91. Dont have an answer for the notches but you may get more replies.
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