1928 Buick Country Club Coupe 54C 128 Ich Wheelbase What Spark Plug Do I Need.

[TriumphDude]

Hello Everyone, i am looking at buying some spark plugs for my 1928 Buick Country Club Coupe 128 Inch Wheelbase. I have been on Bobs Automobilia site and there are two spark plugs available. 1925-1928 Buick Spark Plug Replacement. 77L and the other one is 1929-1937 Buick Spark Plug and AC-86 is their reference.  I think my Buick is a later in the year model. My Engine number is 2185431. Would anyone know which spark plug i should be using.  Many Thanks. Bill.

[Mark Gregush]

Think you might want to post on the Buick section down below. Good chance that you will get more eyes on your question. I checked my interchange book, but it starts at 1930. What plugs are in it now and how did it run? 

Edited February 22, 2023 by Mark Gregush (see edit history)

[Hans1]

THIS DATA IS FROM SEVERAL PLUG LISTS

i HOPE IT HELPS IF YOIU ARE LOOKING FOR OLD ORIGIONAL PLUGS.

CONVERTING TO MORE MODERN NUMBERS IS FUN, ALL ARE 18MM.

 

 THE FOLLOWING EARLY ONES ARE ALL VERY HOT PLUGS, PER CHARTS

 

                                                                        AC      SPLITDORF      AC- UNIVERSAL LINE   FEDERAL 

BUICK   EARLY TO/AND INCLUDING  '24      B             -                            AA                              

BUICK   25,26,27,& 28                                    C             7                            AA

BUICK  29 & 30                                              G14          9                             -                                15

 

     (   G14 AND OTHER AC G SERIES PLUGS REPLACED BY AC  GG )

THE AC  G14 IS A VERY  HOT PLUG, HOTTEST PLUG LISTED, SAME FOR SDORF  7 & 9

 

THE G4 1/2 TO G14 PLUGS ARE NORMAL LIFE - AC LONG LIFE ARE LETTER D, SO G14 AND D14 EQUIVALENT.

//////////////

THE FOLLOWING ARE HOT PLUGS, THE BUICKS MUST NEED THEM.

AC  G14 - GG  - TITAN 2 - AC LONG LIFE D-14 - AC BLUE TOP  88  - OLD CHAMPION #'s -  11  -   9   - H2

 

ALSO D21 & D23 ARE HOT PLUGS

 

UD16 RECOMENDED FOR 1929 TO 1937.

[dodge28]

Sorry, I cannot help. But one word of caution when cleaning older spark plugs.  Do not use metal brush to to clean. It causes metal streaks on the ceramic base  and tracks for sparks to travel.