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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

 

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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.

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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!:)

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