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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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For helping keep this great
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| | | | Joined: Mar 2010 Posts: 10,275 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,275 | That is a quite the challenge right there.
I am sure that you have considered:
Water pump pulley diameter difference.
Crankshaft pulley diameter difference (?).
Impeller design/size difference.
Your estimates of the block hole sizes seem very close to correct. Close enough, given that you are probably looking for a percent difference in total square inches of hole area between the two designs.
Last edited by 52Carl; 07/19/2019 2:20 AM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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