mfg Posted January 16, 2021 Report Share Posted January 16, 2021 The standard spark plug used in Studebaker Avantis was/is a Champion J-12Y....however, if an Avanti owner wanted to use a 'one step colder' spark plug, Studebaker recommended using Champion ......?...... plugs. 1) J61Y.......2) H8.....3) J9YD.....or.....4) H-14Y Link to comment Share on other sites More sharing options...
studegary Posted January 16, 2021 Report Share Posted January 16, 2021 2 hours ago, mfg said: The standard spark plug used in Studebaker Avantis was/is a Champion J-12Y....however, if an Avanti owner wanted to use a 'one step colder' spark plug, Studebaker recommended using Champion ......?...... plugs. 1) J61Y.......2) H8.....3) J9YD.....or.....4) H-14Y Service Letter J-1063-3a says for one step cold to use J-10Y (formally J-9Y), so I will choose your answer 3. Link to comment Share on other sites More sharing options...
mfg Posted January 16, 2021 Author Report Share Posted January 16, 2021 2 hours ago, studegary said: Service Letter J-1063-3a says for one step cold to use J-10Y (formally J-9Y), so I will choose your answer 3. And you are CORRECT! Link to comment Share on other sites More sharing options...
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