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Old 05-29-2012, 06:35 PM   #6
Tarheel
Junior Member
 
Join Date: May 2010
Location: Eastern North Carolina
Posts: 23
Default Re: Full-Flow Oil-Filter Kit from "Motor City Flatheads"

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Some spin-on filters will have an internal check valve to keep oil inside the oil filter when the engine is off. This helps the engine get oil faster when it is just started up. Some do not have the valve. Check the specs on the filter you are using- this may be the cause..
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