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8an or 10an for 261 full flow oil filter
#1388187 Sun Dec 13 2020 09:25 PM
Joined: May 2004
Posts: 919
B
Shop Shark
Hi all! I'm getting ready to plumb my remote filter. I can use 8an or 10an. Is the restriction difference enough to worry about? I have the fittings for 8an tubing, but am wondering if I should get new fittings and use 10an. Thoughts?

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Re: 8an or 10an for 261 full flow oil filter
bigmacdaddy #1388188 Sun Dec 13 2020 09:31 PM
Joined: Feb 2004
Posts: 23,008
H
'Bolter
AN fittings are measured in 1/16" increments, so a #8 line is the equivalent of 1/2". That should be plenty of volume to support a full flow system. All a #10 line will do is contain a few ounces more oil, with no real advantage at the pressure and flow rate of the 261 oil system. Be sure the dowel pin in the flow control system is in the "in" position, as that's the only way a 261 will function as a full flow oil circuit.
Jerry


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Re: 8an or 10an for 261 full flow oil filter
bigmacdaddy #1388260 Mon Dec 14 2020 01:51 PM
Joined: Dec 2005
Posts: 50
5
Wrench Fetcher
Can someone show a picture of where that dowel pin is 0n a 261 engine. I forget.


1951 Chevy 3100 5-window
261 cu in, 348 Head, Split Fenton Exhaust
Offy with Dual Weber 2 Bbl Carbs
Re: 8an or 10an for 261 full flow oil filter
bigmacdaddy #1388262 Mon Dec 14 2020 02:13 PM
Joined: Aug 2018
Posts: 356
D
'Bolter
'51Bowtie, to your question, here is a 261 block, driver's side view, showing the dowel pin pushed in for full flow filtering (green arrow). In this configuration, the two NPT threaded ports (blue arrows) must be connected either through a full flow filter or at least with a length of pipe or hose, 1/2" ID, in order for oil to reach the oil galleries and bearings.

Doug

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Last edited by drdoug; Mon Dec 14 2020 02:55 PM.
Re: 8an or 10an for 261 full flow oil filter
bigmacdaddy #1388429 Tue Dec 15 2020 06:04 AM
Joined: May 2004
Posts: 919
B
Shop Shark
Thanks Jerry! 8an it is!


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62 Fleetside 4spd 235 w/O.D. posi 3:90
90 Subaru Legacy Wagon AWD 2.2 5sp
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Re: 8an or 10an for 261 full flow oil filter
drdoug #1388455 Tue Dec 15 2020 02:40 PM
Joined: Dec 2005
Posts: 50
5
Wrench Fetcher
[quote=drdoug]'51Bowtie, to your question, here is a 261 block, driver's side view, showing the dowel pin pushed in for full flow filtering (green arrow). In this configuration, the two NPT threaded ports (blue arrows) must be connected either through a full flow filter or at least with a length of pipe or hose, 1/2" ID, in order for oil to reach the oil galleries and bearings.
Yep, now I remember. Thanks Doug.


1951 Chevy 3100 5-window
261 cu in, 348 Head, Split Fenton Exhaust
Offy with Dual Weber 2 Bbl Carbs

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