Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 05-04-2018, 12:40 PM   #1
Teltruck
Senior Member
 
Teltruck's Avatar
 
Join Date: Feb 2011
Location: Southern Mass
Posts: 170
Default Head Bolts on a 8BA

My Ford Shop manual says to use a "Water proof sealant on The Threads" .What's the best product to use? Thanks,
Bob
Teltruck is offline   Reply With Quote
Old 05-04-2018, 12:55 PM   #2
51 MERC-CT
Senior Member
 
51 MERC-CT's Avatar
 
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,012
Default Re: Head Bolts on a 8BA

Probably a number of "best" ones but I have always used non hardening Permatex.
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES
51 MERC-CT is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 05-04-2018, 01:06 PM   #3
Init1
Senior Member
 
Init1's Avatar
 
Join Date: May 2010
Location: Oregon City, Oregon
Posts: 208
Default Re: Head Bolts on a 8BA

I agree on Permatex. Never had a leaker.
Init1 is offline   Reply With Quote
Old 05-04-2018, 01:06 PM   #4
GOSFAST
Senior Member
 
GOSFAST's Avatar
 
Join Date: May 2010
Location: Long Island, NY
Posts: 1,040
Default Re: Head Bolts on a 8BA

Quote:
Originally Posted by 51 MERC-CT View Post
Probably a number of "best" ones but I have always used non hardening Permatex.
We do the opposite, we use the Permatex #1, this is the "hard-setting" one. Been using this on all our builds, not only the Flatheads!

Never a single (major) issue so far!

Thanks, Gary in N.Y.

P.S. Would also strongly recommend against using any anti-freeze on the initial run, but be careful in the "cold" weather. Most minor leaks will take care of themselves for the most part! We occasionally see some water coming up the studs on the dyno, they are usually sealed up by the end of the session!
Attached Images
File Type: jpg Sealer Permatex 1C.JPG (70.2 KB, 38 views)
GOSFAST is offline   Reply With Quote
Old 05-04-2018, 02:26 PM   #5
19Fordy
Senior Member
 
19Fordy's Avatar
 
Join Date: May 2010
Location: Coral Springs FL
Posts: 8,182
Default Re: Head Bolts on a 8BA

Gary, Can you re-torque head bolts if you use the hard setting Permatex?
19Fordy is offline   Reply With Quote
Old 05-04-2018, 02:48 PM   #6
Phil Gillespie
Senior Member
 
Phil Gillespie's Avatar
 
Join Date: Sep 2011
Location: Christchurch New Zealand
Posts: 1,322
Default Re: Head Bolts on a 8BA

Sponsored Links (Register now to hide all advertisements)
Quote:
Originally Posted by 19Fordy View Post
Gary, Can you re-torque head bolts if you use the hard setting Permatex?

Good point. That crossed my mins also.
Phil NZ
Phil Gillespie is offline   Reply With Quote
Old 05-04-2018, 04:39 PM   #7
tubman
Senior Member
 
tubman's Avatar
 
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 6,677
Default Re: Head Bolts on a 8BA

I would think the hard setting sealer would be for head studs and the non-hardening Permatex would be better for head bolts. I have used the non-hardening Permatex on the bolts on my last two 8BA builds and have not experienced any leaks.
tubman is offline   Reply With Quote
Old 05-04-2018, 05:19 PM   #8
Ronnie
Senior Member
 
Ronnie's Avatar
 
Join Date: May 2010
Location: Canada Where it snows
Posts: 1,999
Default Re: Head Bolts on a 8BA

This has been used for years and does a good job.
https://www.permatex.com/products/ga...ealant-liquid/

R
Ronnie is offline   Reply With Quote
Old 05-04-2018, 05:22 PM   #9
flatjack9
Senior Member
 
flatjack9's Avatar
 
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 3,787
Default Re: Head Bolts on a 8BA

Well, being a plumber, I have always used a good grade Teflon pipe joint compound.
flatjack9 is offline   Reply With Quote
Old 05-04-2018, 06:09 PM   #10
tubman
Senior Member
 
tubman's Avatar
 
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 6,677
Default Re: Head Bolts on a 8BA

Jack, No offense intended, but I am curious. Teflon pipe joint compound is for tapered fittings, while the head bolts/studs in a flathead are straight threads. Wouldn't this require two different types of sealer?
tubman is offline   Reply With Quote
Old 05-04-2018, 08:00 PM   #11
burnette
Senior Member
 
Join Date: Feb 2017
Location: quebec canada
Posts: 117
Default Re: Head Bolts on a 8BA

can you back of nut and apply the sealant.and retorque. or do you apply the sealant on the stud treads. i just started my freshly rebuilt flathead ,and i got 3 leaking head nuts.
burnette is offline   Reply With Quote
Old 05-04-2018, 08:17 PM   #12
chap52
Senior Member
 
chap52's Avatar
 
Join Date: Jun 2013
Location: Marana Arizona
Posts: 1,607
Default Re: Head Bolts on a 8BA

I like the Permatex Thread Sealant . Easy to apply and does a great job.
https://www.zoro.com/permatex-thread...32/i/G1245867/
chap52 is offline   Reply With Quote
Old 05-04-2018, 08:43 PM   #13
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 15,067
Default Re: Head Bolts on a 8BA

Quote:
Originally Posted by burnette View Post
can you back of nut and apply the sealant.and retorque. or do you apply the sealant on the stud treads. i just started my freshly rebuilt flathead ,and i got 3 leaking head nuts.
If it's a stud with a nut then you need to pull the stud. The sealant is for the stud threads into the block. If the studs are not super tight in the block you should be able to pull them by double nuting the stud and then use the bottom nut to back the stud out.
JSeery is online now   Reply With Quote
Old 05-05-2018, 05:47 AM   #14
burnette
Senior Member
 
Join Date: Feb 2017
Location: quebec canada
Posts: 117
Default Re: Head Bolts on a 8BA

thanks jseery. would it be Wise to add some kind of stop leak to prevent other studs from leaking!
burnette is offline   Reply With Quote
Old 05-05-2018, 08:05 AM   #15
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 11,941
Default Re: Head Bolts on a 8BA

Times change and new stuff shows up whether good or not so much. I use an expensive stuff that is hard to get at a decent price but it works well. The stuff is called Mastinox D40. It doesn't harden and has corrosion inhibitors to protect the joint. The stuff is made by PPG Aerospace and is stupid high in price. It is rated to work where temps can exceed 200 C. If using it for stuff like this, it's best to find it where the product has exceeded its shelf life and can no longer be used in aviation. MEK can be used as a solvent to thin the stuff out a bit. I believe this type also has zinc chromates in it which are known carcinogens. Where head bolts go into water, I like the extra corrosion protection. It's hard enough to loosen them when there is no corrosion but when there is, that's when bolts break.


There is a one that works in the range above coolant temperatures that is less expensive and it is Mastinox 6856K that works to over 150C. It is still stupidly high priced though.

Last edited by rotorwrench; 05-05-2018 at 08:18 AM.
rotorwrench is online now   Reply With Quote
Old 05-05-2018, 09:06 AM   #16
flatjack9
Senior Member
 
flatjack9's Avatar
 
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 3,787
Default Re: Head Bolts on a 8BA

Quote:
Originally Posted by tubman View Post
Jack, No offense intended, but I am curious. Teflon pipe joint compound is for tapered fittings, while the head bolts/studs in a flathead are straight threads. Wouldn't this require two different types of sealer?
Been using it forever with no leaks. Remember the head bolts are a tight fit.
flatjack9 is offline   Reply With Quote
Old 05-05-2018, 09:09 AM   #17
flatjack9
Senior Member
 
flatjack9's Avatar
 
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 3,787
Default Re: Head Bolts on a 8BA

Quote:
Originally Posted by burnette View Post
can you back of nut and apply the sealant.and retorque. or do you apply the sealant on the stud treads. i just started my freshly rebuilt flathead ,and i got 3 leaking head nuts.
Just run water in the engine for a while and the leaks will probably stop.
flatjack9 is offline   Reply With Quote
Old 05-05-2018, 09:35 AM   #18
Ronnie
Senior Member
 
Ronnie's Avatar
 
Join Date: May 2010
Location: Canada Where it snows
Posts: 1,999
Default Re: Head Bolts on a 8BA

This will keep you out of the woods also.
https://www.skygeek.com/valco-71292-...SAAEgLZs_D_BwE

I have used it many tines .

R
Ronnie is offline   Reply With Quote
Old 05-05-2018, 10:14 AM   #19
tubman
Senior Member
 
tubman's Avatar
 
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 6,677
Default Re: Head Bolts on a 8BA

It's nice to hear that there are as many really high-end products there are out there as have been mentioned. However, as a matter of fact, I believe that most of the "regular" sealants in the chem section of your "FLAPS" are totally adequate for the job.
tubman is offline   Reply With Quote
Old 05-05-2018, 08:21 PM   #20
Bored&Stroked
Senior Member
 
Bored&Stroked's Avatar
 
Join Date: Jan 2011
Location: Central Ohio
Posts: 2,736
Default Re: Head Bolts on a 8BA

I always use ARP PTF/Teflon based stud sealer on all my builds -- well, at least the ones with "wet decks". LOL

D
Bored&Stroked is offline   Reply With Quote
Old 05-07-2018, 08:11 AM   #21
GOSFAST
Senior Member
 
GOSFAST's Avatar
 
Join Date: May 2010
Location: Long Island, NY
Posts: 1,040
Default Re: Head Bolts on a 8BA

Quote:
Originally Posted by 19Fordy View Post
Gary, Can you re-torque head bolts if you use the hard setting Permatex?
There's absloluetly no problem re-torquing head bolts when using the #1 Permatex, it takes a very long time for this sealer to actually "setup" as solid?

Generally you have a fair amount of time to go over the fasteners again if necessary!

(Add) Just a tip I keep mentioning when filling the cooling system from "day-one", do NOT put any anti-freeze in at all, use only fresh water (BUT, do be aware of the weather conditions?). The anti-freeze tends to retard any pin-leaks from sealing themselves up especially in the head bolt/stud area. Occasionally during a dyno session we'll see water coming up some studs on a few of the Chevy's, by the time the session is over they have all usually stopped leaking!

Thanks, Gary in N.Y.

P.S. On a side note here we've not found it necessary to re-torque any Flathead heads after they're bolted on, none of my customers have either that I'm aware of anyway! I assume much of this depends on the choice of gaskets/fasteners? We mostly use ARP on a regular basis!
GOSFAST is offline   Reply With Quote
Old 05-07-2018, 08:31 AM   #22
19Fordy
Senior Member
 
19Fordy's Avatar
 
Join Date: May 2010
Location: Coral Springs FL
Posts: 8,182
Default Re: Head Bolts on a 8BA

Thanks, Gary for that very helpful information.
19Fordy is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 05-07-2018, 08:59 AM   #23
JWL
Senior Member
 
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 2,034
Default Re: Head Bolts on a 8BA

I do not know how many engines (Flathead) I have dealt with but I have NEVER seen one that did not need head bolts/studs re-torqued after cycling. I have used several different thread "sealers" and mostly have used #2 Permatex over the past 10 years because it is easy to find and works.
JWL is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 10:20 AM.