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Click on image for the lowdown. 
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| | | Forums66 Topics128,100 Posts1,056,513 Members48,448 | | 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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| | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Yes, you can plumb the 1958-1963 USA 261 with a spin-on full-flow oil filter adapter.
Yes, in those years/engines, there in a pin/plug in the USA 261 block that has to be "set" for/from bypass or full-flow.
Original full-flow filter is shown below. | | |
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