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Old 12-07-2010, 10:14 AM
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freeze plug

i have a 71 small block 350 in a 65 chevy k10 pickup. i blew a freeze plug yesterday, and ive never changed one before. it is on the side of the block, on the drivers side. what is the best meathod to replace this freeze plug???

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Old 12-07-2010, 11:44 AM
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???????????? Well if you get down and look you'll see coolant leaking out of the hole where the plug USED to be. On a 350 SBC you have 2 up front, 2 on each side and 2 in the rear (hope it isn't one of those, you'll have to remove the trans and flexplate). The plug may still be there but corrosion has worn a hole in it. If it is you have to pry it or knock it sideways with a screw driver then grab it with a pair of channel locks and Presto!!

You can use steel or brass plugs (I like brass), some guys install them dry or use a little sealer and CAREFULLY pound them in with a socket that just fits inside the neck of the plug......really not a big deal IF you have the necessary room to work. Good idea to check the rest of them for seepage and when finished refill with some good anti-freeze.
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Old 12-07-2010, 11:47 AM
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If you can get at it, clean the sealing area/rim really good, I then use Form-A-gasket, the brown gooey stuff, and a large socket that just fits the I.D. to drive the new one in, normally about 1/8 inch into the block. Could be a chore with the engine in the car. Be careful not to punch it clear inside.
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Old 01-17-2011, 11:51 PM
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just did them in my 327

i just replaced the freeze plugs in my 68 327.iv always used a flat head screwdriver and punched it through the old freeze plug and pried a "slot" in the old plug to allow it to flex a little easier. the goal is to rotate the plug not punch it into the block!!! pry the slot a decent ways then put the flat head on the rim of the plug and slowly tap with a hammer as soon as u can grab the opposite side of the plug grab it with some pliers or vise grips and give her a tug. i personaly use the brass plugs they seem to last a bit longer than the steel for not much more coin. mine from summit were less than $20. good luck.
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Old 01-18-2011, 04:29 PM
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^^^^^^^^^^^^^
Did you use sealant? What brand were the plugs, Dorman?
I have a 3.0 V6 Ford. One freeze plug blew out on the side. The Dorman plug's flange is only 1/2 the width of the original. Because it went in very easily, I'm a little leery about pressurizing the system with the radiator cap and having it blow out.
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Old 01-18-2011, 05:18 PM
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Quote:
Originally Posted by scrot
^^^^^^^^^^^^^
Did you use sealant? What brand were the plugs, Dorman?
I have a 3.0 V6 Ford. One freeze plug blew out on the side. The Dorman plug's flange is only 1/2 the width of the original. Because it went in very easily, I'm a little leery about pressurizing the system with the radiator cap and having it blow out.
If the plug is square to the hole, you can do one of a couple things to assure the plug stays put.

One is to stake the plug, as seen on these smaller oil plugs:



Or, use retaining pins:



Or screws, these are also safety wired:



If I were going to replace JUST one plug- and it failed due to rust/corrosion- I would use a rubber expansion plug.

They seal just fine, are easy to install, and if one freeze plug went, the others cannot be far behind. When the next plug lets go, I'd be pulling the engine to do them all, if that's what's required on that particular vehicle.


RUBBER EXPANSION PLUG
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Old 01-18-2011, 06:49 PM
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Yes. Good idea using the rubber expansion plug.
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Old 01-19-2011, 12:24 AM
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seal goo

Quote:
Originally Posted by scrot
^^^^^^^^^^^^^
Did you use sealant? What brand were the plugs, Dorman?
I have a 3.0 V6 Ford. One freeze plug blew out on the side. The Dorman plug's flange is only 1/2 the width of the original. Because it went in very easily, I'm a little leery about pressurizing the system with the radiator cap and having it blow out.
i personaly didnt use sealant.. i ordered summits brass plug kit.
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Old 01-19-2011, 08:56 AM
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I have had the best results knocking the plug to the inside and then turning it sideways and prying it out. I had to replace two in my T-bucket last week and they were tight. Just be careful not to drive in to far . The cylinder is very close to the core plug hole on some cyls. On the Ford with the short core plug. I'd go back to the parts store. Many core plugs are available in either a shallow or deep style. Sounds like they sold you the shallow one . Allan
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Old 01-19-2011, 06:43 PM
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According to the Dorman catalog they have only one type of 1 1/2" steel plug.
Dorman Catalog
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Old 01-20-2011, 08:22 AM
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Quote:
Originally Posted by scrot
According to the Dorman catalog they have only one type of 1 1/2" steel plug.
Dorman Catalog
I actually took the time to look through the plugs listed for Ford and found there are two numbers listed for an 1-1/2" plug : 555-077 and 555-028 .
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Old 01-20-2011, 11:14 AM
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The 555-028 is a common plug used on SBC. So it would have a lip like any regular SBC block core plug. Perhaps TOO much lip for the 3.0L Ford application.

The shallow lipped plug could be used in locations on that engine where there is a back-side clearance issue, or a thin casting wall.

The "book" calls for the 077 on the 3.0L Ford, so maybe they know something we don't.
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