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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,118 Posts1,056,304 Members48,439 | | 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!
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For helping keep this great
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| | | | Joined: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 | Let me reword that a bit so I can understand. Is it:
(#2) is connected to the oil passage (main and cam bearings)?
The smaller hole (?) is also connected to (#2) and the oil passage?
OR
(#2) is only connected to the smaller hole (?) of the ODV.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
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