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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,157 Posts1,056,894 Members48,458 | | 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: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | I just pulled apart a 1954 235 with a by-pass filter that has run about 5,000 miles over the past 4 years and has had the filter element changed every two years (whether it was needed or not).
I also just pulled apart a 1960 261 engine with a full-flow spin-on filter (factory full-flow plumbing but after-market spin-on filter unit) that has run about 1,000 with the same spin-on filter).
Both engines look about the same under the valve covers.
I'd say the full-flow set-up is better but the by-pass set-up is quite adequate if you change your oil and filter regularly. | | |
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