Posted by Bob on April 14, 2011 at 10:29:49 from (64.255.159.192):
In Reply to: Chev 454 oil cooler posted by Rick Kr on April 14, 2011 at 10:03:53:
This is NOT specific to your engine, but typically if the ports are simply plugged an internal oil cooler bypass valve will be held open by the flow of oil.
There MAY be a smaller plug inside one of the ports that can be removed to prevent this and allow the free flow of oil.
Another thing GM sometimes did was to make one of the cooler fittings with a sort of "probe" attached that plugged the internal passage when an external cooler was installed. Removing the special fitting opens up the internal passage. You might try removing the fittings and see if one is made like that.
BTW, you can replace the cooler lines WAY cheaper by using hydraulic hose with flareless connectors at each end to match the metal part of your cooling lines.
The implement dealership where my BIL works gets a lot of business from the local Chevy dealer who does just that.
ANY shop with a hydraulic hose machine and a good stack of fittings should be able to make you up a set.
The link below will show the type of fitting I am talking about:
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