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Click on image for the lowdown. 
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| | | 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | That's the oil return for the original bypass filter. Since it is open to the crankcase, it definetly needs to be plugged. I beleive it's 1/8 NPT.
Bill Burmeister
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