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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Up to 1940 there was a factory reducer, similar to what Tim linked to, only it was slightly taller.
What year is the engine? You do not want to use a 1940 head on a 1941 or later engine. 1940 was the last year to use dome pistons. If you use a 1940 head on a 1941 or later engine you will have very low compression.
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