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What many hobbyists do not know is the 1932 Ford V8 engine for that year only, had cylinder heads with the same spark plug thread openings as Model A and Model B heads, thus it was possible for the Model A and B to share a spark plug with the 1932 V8. That change did not follow through for 1933 V8 engines and they used a C 7 spark plug, followed by a mid 1934 change to number 7 plug which was used to 1937.