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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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The smaller diameter spark plug was used through 1948. The larger diameter plug was used from 1949 onwards. In 1949, there were also other changes in the head.
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