Classic/Antique Car Repair: PLUG SEQUENCEON 1940 BUICK40SERIES, firing order, spark plug

Question
I AM HAVING TROUBLE LOCATING THE CORRECT SPARK PLUG FIRING ORDER FOR A 1940 BUICK SPECIAL 40 SERIES MOTOR. ANY HELP WOULD BE GREATLY APPRECIATED.

Answer
Hi Jim:
I will have to search around, because this is one of the most difficult question to answer. However, GM put the firing order on the top of the engine of many of there cars. Not sure if yours was one of them, but see if it is and if it is still visible. Otherwise, we may have to look elsewhere. Get back to me and I will research it further. Thanks.