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Click on image for the lowdown. 
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| | | Forums66 Topics128,057 Posts1,055,810 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!
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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: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | If it looks like THIS it is a by-pass hole. It is designed to let oil into the oil pump if the screen gets plugged. If the screen gets plugged the screen is sucked up away from the cover exposing the hole. It should not normally be exposed.
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