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Dorman freeze plug

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86 1/2 Brutus

Dorman freeze plug

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?

Nick and George
1986 1/2 F150 XLT Lariat 4X2 300 Six - C6 - 3:08 in a 8.8 - Fully Loaded - 8 Foot Box
Owned since new

85lebaront2

Re: Dorman freeze plug

Administrator

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.

Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

86 1/2 Brutus

Re: Dorman freeze plug

makes sense

Nick and George
1986 1/2 F150 XLT Lariat 4X2 300 Six - C6 - 3:08 in a 8.8 - Fully Loaded - 8 Foot Box
Owned since new

86 1/2 Brutus

Re: Dorman freeze plug

do you have to bang them with a hammer to start them or just start turning the wrench?

Nick and George
1986 1/2 F150 XLT Lariat 4X2 300 Six - C6 - 3:08 in a 8.8 - Fully Loaded - 8 Foot Box
Owned since new

85lebaront2

Re: Dorman freeze plug

Administrator

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 AKA "LOBO" Profile

FordFETruck

Re: Dorman freeze plug

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!

1986 F250 351W, C6, 10.25 Semi float 3.55 gear, 250K Miles