1924-1942 Olds sparkplug chart

mlander · September 18th, 2006

AC OLDSMOBILE SPARKPLUG SPECIFICATION CHART
1945 ISSUE Passenger Cars- 1924-1942

Oldsmobile ?Model 30??????????.?..76S
All others thru 1927...............................77
1928 thru 1936???????????????.?86
1937-38-39-40????????????????.45
1941-42?????????????????..?....44
M.L. Anderson

rocketraider · September 18th, 2006

An excellent technical post! Thank you mlander! Now to figure out how to keep it visible and not get lost in the shuffle...

Folks- we need more of this type stuff. If you have info like this for ANY YEARS Oldsmobile, please feel free to post it.

mlander · November 22nd, 2006

This is to add to the chart above but is only about 18mm by 1/2" reach sparkplugs and to sparkplugs made after 1937 when AC changed their numbering system to the one shown.
Ml.L. Anderson

CHAMPION------ CHAMPION-------AUTOLITE------AUTOLITE-------DELCO AC--------DELCO AC-------
NEW-------------EXTENDED-------NEW-----------EXTENDED-------NEW------------EXTENDED-------
18mm BY---------CORE-------------------------- CORE--------------------------- CORE------------
½? REACH--------NOSE---------------------------NOSE----------------------------NOSE------------
----------------------------------373------------------------------C 81----------------------------
D6------------------------------- 373--------------------------------------------------------------
D9------------------------------- 373------------------------------C82-----------------------------
D9--------------------------------373------------------------------C83-----------------------------
NONE-----------------------------386------------------------------C85-----------------------------
NONE---------------------------------------------3116-----------------------------C85S------------
NONE------------D15Y----------------------------3116----------------------------------------------
D16-------------------------------386------------------------------C86-----------------------------
NONE------------D18Y----------------------------3116----------------------------------------------
D21-------------------------------386------------------------------C87-----------------------------
D23-------------------------------386------------------------------C88-----------------------------

oldsmobile1915 · July 16th, 2007

I know for the 238 cu in inline 6 cyl (I believe the same engine was used 1937-1949) used AC R45 spark plugs. That's what's in my 1948 Dynamic 66. ( www.geocities.com/oldsmobile1948 )

Best,

Joe Ferrero