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02-27-2009, 11:25 PM
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CC Member
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Join Date: Jun 2007
Location: Cirencester,
UK
Cobra Make, Engine: Unique Autocraft Python
Posts: 49
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Not Ranked
Freeze plugs
I need to change the freeze plugs on my Ford 5.0 HO V8 EFI. Jegs only sell brass plugs. Has anybody used these and are they any good? Any problems with leaks?
Cheers,
Ian
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02-28-2009, 04:39 AM
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CC Member
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Join Date: Feb 2006
Location: Lake Havasu City, AZ,
AZ
Cobra Make, Engine: Arps/Burroughs/Hurricane/428FE
Posts: 1,346
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I think brass is the very best..or at least it use to be. Plain metal will corrode out sooner than brass. I don't know these days, maybe there are some better types..like Stainless steel or Kriptonite...?
Bill
PS. If the plug leaks a bit after you install it (which it should not) just dump some Alumi Seal in the old radiator to fix it.
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02-28-2009, 04:46 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
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I have never used anything but brass on my engines. Just wipe a little bit of RTV around them before you install. If you don't have a freeze plug driver, just use the biggest socket that you can fit into the plug.
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www.lykinsmotorsports.com
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02-28-2009, 08:10 AM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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or you can get a very large pipe tap and thread the freeze plugs holes and buy the BOSS 302 freeze plug kit and use the screw-in freeze plugs.......
Not hard to do..........
David
http://www.clubcobra.com/photopost/d...28MVC-012S.JPG
__________________
DAVID GAGNARD
Last edited by DAVID GAGNARD; 02-28-2009 at 08:13 AM..
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02-28-2009, 08:49 AM
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Senior Club Cobra Member
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Join Date: May 2006
Location: Manteca,
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Cobra Make, Engine: None, sold it
Posts: 2,439
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Quote:
Originally Posted by blykins
I have never used anything but brass on my engines. Just wipe a little bit of RTV around them before you install. If you don't have a freeze plug driver, just use the biggest socket that you can fit into the plug.
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Blykins,
Does the RTV help keep the plugs from blowing out? My brother-in-law had a jet boat with a 460 in it and he kept blowing out the freeze plugs. Made it a real exciting boat ride, trying to keep the boat from filling with water.
Terry |
02-28-2009, 08:50 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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David: 2 Very large taps, one to start the threads and a shorter (cut off with abrasive wheel) to finish the last of the threads without hitting the outside of the cylinders, or tap all the hole initially wiht the full length tap, then cut it off and continue enlarging each previously threaded hole. Then you only buy 1 tap.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 03-01-2009 at 08:19 AM..
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02-28-2009, 10:01 AM
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CC Member
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Join Date: Jan 2005
Location: Hillsboro,
OR
Cobra Make, Engine: Scratch built CSX style frame, Carbon fiber body, 393 Stroker, T-bird IRS, T5
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Terry, the RTV helps the freeze plugs to seal. The Brass plugs are the best, IMHO and usually go in fine if you use the right sized driver (socket). Just don't drive them in too far or you'll be saying bad words trying to get them back out. I usually drive them in just so the lip of the plug is right at the bottom of the taper of the freeze plug hole. '
If you're buddie's boat is blowing out freeze plugs, he has a serious overheating problem or a thermostat that won't open.
Bob
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02-28-2009, 09:19 PM
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CC Member
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Join Date: Jun 2007
Location: Cirencester,
UK
Cobra Make, Engine: Unique Autocraft Python
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Thanks for all the tips on freeze plugs. I better get on with it.
Cheers,
Ian
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03-01-2009, 04:22 AM
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CC Member
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Join Date: Mar 2003
Location: Baltimore,
Md
Cobra Make, Engine: EM Replica, 427 s/o, Vette suspension
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Does anyone know where you can get BRASS SCREW-IN freeze plugs?
__________________
*** OF GREAT WORTH *** And JESUS asked again, The Kingdom of GOD, how shall we think about it, and to what can it be compared? Is it not like a Dark blue 427 Cobra, which a man found parked on his street one day? He hurried off and sold all that he had; the 57 Thunderbird, the 63 Stingray, the XKE, and bought the dark blue 427 Cobra. The disciples frowned and scraped their feet; JESUS grinned and popped the clutch. --- Harris Wolfe
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03-01-2009, 09:05 AM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
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Quote:
Originally Posted by Rick Parker
David: 2 Very large taps, one to start the threads and a shorter (cut off with abrasive wheel) to finish the last of the threads without hitting the outside of the cylinders, or tap all the hole initially wiht the full length tap, then cut it off and continue enlarging each previously threaded hole. Then you only buy 1 tap.
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Rick:
The picture of the block is my race motor and the only reason we did that, is, one of the freeze plug holes was badly pitted and we thought sealing would be an issue, it's a 1971 302 junkyard block...The machine shop that did my boring had the tap and they had cut it down as you stated. He does this on just about all the Ford blocks he builds for racing purposes, from 302s to 460s....
I've never ever had any problems with regular ole brass freeze plugs, we just did this one cause of the pitting in the hole, but, now, since he has the tap, I'll probably do all my blocks, it just looks cool as well as being very functional....he found a shop that sells the freeze plugs fairly cheap, I wanna say maybe fifteen bucks for the set......
Quote:
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Does anyone know where you can get BRASS SCREW-IN freeze plugs?
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I've never seen any, but, then, I've never looked for them either... I would look at some industrial hardware/plumbing places, I'm sure you could find them at places like that or they could order them for you......
David
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DAVID GAGNARD
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03-01-2009, 10:20 AM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
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Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
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I ahve also never had a problem with the Brass freeze plugs and they look nice too!!
john
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03-01-2009, 04:55 PM
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Join Date: Mar 2002
Location: so cal,
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Cobra Make, Engine: I used to fix them for a living
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Quote:
Originally Posted by ccomt
Does anyone know where you can get BRASS SCREW-IN freeze plugs?
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I would use a screw-in freeze plug of the same material as the block.
That is if I decided the press-in plugs were inadequate, or if I were filling the water jackets of a drag motor.
There is nothing to gain for 99% of applications, but you do lose the mechanical overpressure vent for the block.
__________________
In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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03-01-2009, 04:57 PM
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Join Date: Oct 2003
Posts: 4,078
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Quote:
Originally Posted by Mr.Fixit
I would use a screw-in freeze plug of the same material as the block.
That is if I decided the press-in plugs were inadequate, or if I were filling the water jackets of a drag motor.
There is nothing to gain for 99% of applications, but you do lose the mechanical overpressure vent for the block.
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Hey Fixit,
Good to see you-where you been?
__________________
Chas.
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