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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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!
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| | | | Joined: Apr 2013 Posts: 43 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2013 Posts: 43 | I have cleaned and sandblasted my oil filter housing and have noticed that on the return tube for the outlet there seems to only be one small hole not much bigger than a pencil lead to allow oil to enter the exit tube. Is this right or maybe mine are plugged. think it is an AC S-6 | | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | | | | | | Joined: Aug 2011 Posts: 687 Shop Shark | | Shop Shark Joined: Aug 2011 Posts: 687 | I can't remember what the purpose for the small hole? Is it to restrict flow ??
careful.. I might learn something...
Last edited by DMGfifty; 05/04/2013 7:43 PM.
| | | | | Joined: Dec 2006 Posts: 720 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 720 | Just a shot in the dark here, maybe being a bypass filter the restriction keeps the oil flowing through the engine instead up following the path of least resistance through the filter?
On my 270 the housing holes are the same all the way through, but the brass fittings on the original tubes had a pretty small opening.
1956 GMC 370 dump " 'Tater "1970 VW Volksrod "the Black Bomber" 2007 Chevy Avalanche 2020 Jeep Cherokee Trailhawk, 2005 Harley Davidson FLHTCUI I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P
| | | | | Joined: Aug 2011 Posts: 687 Shop Shark | | Shop Shark Joined: Aug 2011 Posts: 687 | Good thought. I'll bet Pre68Dave knows.... Along with others
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | The restrictor fitting is there to prevent oil pressure loss to the engine.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Apr 2013 Posts: 43 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2013 Posts: 43 | | | | | | Joined: Apr 2013 Posts: 21 New Guy | | New Guy Joined: Apr 2013 Posts: 21 | Was it on the return or supply line ? I could be wrong but I reconditioned one and I swear it was marked 'inlet' | | | | | Joined: Apr 2013 Posts: 43 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2013 Posts: 43 | Yes, it is the return, on the bottom.
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