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Old 03-26-2014, 10:18 PM   #1
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Core/Expansion Plug

Was reading my Haynes/Chilton manual this morning trying to figure out what the plugs on the side of the block were called. And, as you can see by the title of this post, I did find it. However, when I search for these plugs on O'Reilly's or RockAuto's website it is referred to as an Expansion Plug. Just trying to figure out if these are one in the same. Any help would be appreciated. Thanks.

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Old 03-26-2014, 10:23 PM   #2
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I Believe they are the same thing i use to call the freeze plugs. They are designed to pop out when the coolant in the block freezes instead of cracking the block.

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Old 03-26-2014, 10:27 PM   #3
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Thanks. O'Reily's website does call them Expansion/Freeze Plugs. Would you recommend the brass or the rubber style plugs?
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Old 03-26-2014, 10:35 PM   #4
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it depends how much room you have to work with. the brass ones will need to be hammered into place the rubber ones are probably bolted in. had a car rust one out and i just put in a engine block heater in its place. easier to but in as it was right under the exhaust manifold.
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Old 03-26-2014, 10:41 PM   #5
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I'd have plenty of room. All I'd have to do is take off the carb and both the intake and exhaust manifolds and then pop them out. I have one rusted pretty bad and noticed it started leaking from a pin size hole. Just trying to figure out what would be better and last longer in there. Thanks for the help.
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Old 03-27-2014, 07:12 AM   #6
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FYI they are called CORE plugs because when sandcasting the head or block they are sand cast these holes allow the sand to be removed from the part after casting. In most cases they do little to prevent cracking when coolant freezes inside them. I try to replace bad ones with brass ones and only use rubber ones as a TEMPORARY repair until a proper one can be installed.
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Old 03-27-2014, 07:43 AM   #7
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Lol mowrangler ya beat me to it. My buddy lost a 350 block because of no coolant. Told him it would crack the block and he said " Well thats what the freeze plugs are for so im fine." Tried to convince him otherwise and he would not listen. Next day he went out and found out that the engine block cracked in 3 places. He listens to me now about coolant and how it helps keep things lubed and cooled. Back on topic though core plugs are cheap. If it was me i would replace as many as you can get to. If ya got one bad one then ya prolly have more about to break through and leak.
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Old 03-28-2014, 12:18 AM   #8
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Thank you very much gentlemen. I'll stop by O'Reillys tomorrow afternoon and pick em up. I do plan on replacing all of them at the same time so I wont have to go back and replace them separetly. Appreciate the help.

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