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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,049 Posts1,055,679 Members48,426 | | Most Online14,466
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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Dec 2012 Posts: 97 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2012 Posts: 97 | Here are two formulas that return in almost the same results.
1. "(CID/2) * (RPM/1728) = CFM"
2. "CID * 2 * .8 = CFM"
* is multiply
Got them from a discussion in another forum. These made the most sense to me.
Plug in your Cubes and your close. | | |
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