Re: Packard model 2365, 288 cubic inch engine running hot

Posted by HH56 On 2015/5/31 12:29:14

There are numerous water pathways involving holes and slots in the block which mate with corresponding areas in the head. After leaving the dist tube whose primary function is to ensure cooled water is directed first onto the valve seat areas it is disbursed in several directions thruout the engine -- back across the cylinder walls for one and up into the head for another. Once in the head it again goes across and travels the length until it reaches the exit point where the thermostat resides and then into the top of the radiator.

It is conceivable there is more crud in the engine and also in the head. Without removing the core plugs and prodding any scale on the drivers side of the engine it is hard to estimate how much might still be remaining in the block. The head has no cleanout areas other than the holes and slots which mate to the block so possibly some scale has deposited there. I don't believe any of the holes are larger than maybe 3/4" so if any scale has built up around the holes it could restrict flow.