86 12 Brutus Posted February 18, 2023 Share Posted February 18, 2023 7 or 8 years ago, we blew a freeze plug on the cylinder head and replaced it with a Dorman rubber one. It blew out the other day. We were just going o replace it with another rubber one. ( we plan on pulling the engine in a few months and replace all the freeze plugs, gakets, seals, timing chain etc. On doing an internet search, I see Dorman also makes a copper one that you can put in with a wrench. I've only seen one mention of this in another forum where the guy says they work so well that he replaced all of his with these. I cant find any other info on them. Does anybody have any clue? Link to comment Share on other sites More sharing options...
85lebaront2 Posted February 18, 2023 Share Posted February 18, 2023 I have used them before, I believe on a 390 FE engine, They have a slightly coned inner dish that when the nut is tightened flattens to spread and secure the copper portion. Link to comment Share on other sites More sharing options...
86 12 Brutus Posted February 18, 2023 Author Share Posted February 18, 2023 I have used them before, I believe on a 390 FE engine, They have a slightly coned inner dish that when the nut is tightened flattens to spread and secure the copper portion. makes sense Link to comment Share on other sites More sharing options...
86 12 Brutus Posted February 18, 2023 Author Share Posted February 18, 2023 makes sense do you have to bang them with a hammer to start them or just start turning the wrench? Link to comment Share on other sites More sharing options...
85lebaront2 Posted February 19, 2023 Share Posted February 19, 2023 do you have to bang them with a hammer to start them or just start turning the wrench? I think it tapped in, but not super tightly, then I held the hex on the plug body and tightened the acorn nut. BTW, you haven't lived until you've had a rubber one blow out of a 390 and dump all the coolant on the shop floor. Link to comment Share on other sites More sharing options...
FordFETruck Posted February 22, 2023 Share Posted February 22, 2023 I think it tapped in, but not super tightly, then I held the hex on the plug body and tightened the acorn nut. BTW, you haven't lived until you've had a rubber one blow out of a 390 and dump all the coolant on the shop floor. Bill, there have been people that have put 1 3/4" steel and brass core plugs in FE engines and had those blow out as well because they actually take 1 49/64" diameter plugs and most of the kits come with 1 3/4". Can't imagine the shower that would give especially when hot! Link to comment Share on other sites More sharing options...
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