Sealing the thermostat housing... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**COBALT** · 10-09-2003, 01:20 PM

Back when I had a cast-iron intake that was filthy dirty and didn't want to seal at the thermostat housing I came across Fel-Pro's reusable thermostat housing gasket:

Updated linkhttp://www.federalmogul.com/en/After...mostatGaskets/

Instead of messing around with sealants, and paper gaskets this thing is installed dry. Just clean off your mating surfaces on your housing and your intake with some brake cleaner and a scrubbing pad like scotch-brite, until it's squeaky clean and dry to the touch. Install this thing, and snug the bolts down by hand (don't torque). This gasket protects a bit from overtightening, but it doesn't have to be all that tight to begin with.

It should seal like a charm. Best part is you can take it off later, clean it off, and re-use it.

I have two of them (one i had to modify when a bolt hole had been retapped in an old intake), but the one I use now I've reinstalled 3 times with no problems.

70c10 · 10-09-2003, 05:19 PM

Does that have a built in o-ring?

**COBALT** · 10-10-2003, 04:34 PM

Yes, but it's not rubber. It's the same material the 1pc SBC oil pan gasket is made of, so it won't harden, and blow out. It's embedded inside the plastic/fiberglass body the gasket is made of, and looks more like a raised edge than a round O-ring, so when it flattens out after being tightened it will seal flatter than a standard O-ring.

bpmcgee · 10-10-2003, 04:58 PM

Cobalt,

I have to agree those things are slick.

I had a '74 with an old intake that I just couldn't get to seal. Switched to that, and it sealed like a charm every time.

Brian

Mike76251 · 01-02-2004, 04:55 AM

You can get them at the GM place too.
They are not Felpro's but they are the same thing.
I might add they work GREAT.

krue · 04-27-2007, 10:49 AM

Thanks to Rickf for pointing the following out:

The following message was sent to you via the The 1947 - Present Chevrolet & GMC Truck Message Board Network Contact Us form by rickf.

--------------------------------

I was reading the faq and found the one about sealing a thermostat, whihc is a problem I am currently trying to solve.
(Thread: http://www.67-72chevytrucks.com/vboa...ad.php?t=72077)

The link in the thread no longer works, and the "magic gasket" is not directly named. It took a little while but I finally found on the federal-mogul page the name of the product line. I wanted to add it to the thread but apparantly I am not authorized to update the FAQ, according to the little box of permissions.

The info is this:

The gasket product line is called PermaDryPlus, by Fel-Pro.

--------------------------------

Referring Page: http://www.67-72chevytrucks.com/vboard/faq.php
IP Address: 24.20.83.71
User Name: rickf
User ID: 21172

10-09-2003, 01:20 PM	#1
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Sealing the thermostat housing... Back when I had a cast-iron intake that was filthy dirty and didn't want to seal at the thermostat housing I came across Fel-Pro's reusable thermostat housing gasket: Updated linkhttp://www.federalmogul.com/en/After...mostatGaskets/ Instead of messing around with sealants, and paper gaskets this thing is installed dry. Just clean off your mating surfaces on your housing and your intake with some brake cleaner and a scrubbing pad like scotch-brite, until it's squeaky clean and dry to the touch. Install this thing, and snug the bolts down by hand (don't torque). This gasket protects a bit from overtightening, but it doesn't have to be all that tight to begin with. It should seal like a charm. Best part is you can take it off later, clean it off, and re-use it. I have two of them (one i had to modify when a bolt hole had been retapped in an old intake), but the one I use now I've reinstalled 3 times with no problems. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA. Last edited by augie; 04-17-2011 at 12:25 PM.

10-09-2003, 05:19 PM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Does that have a built in o-ring? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

10-10-2003, 04:34 PM	#3
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Yes, but it's not rubber. It's the same material the 1pc SBC oil pan gasket is made of, so it won't harden, and blow out. It's embedded inside the plastic/fiberglass body the gasket is made of, and looks more like a raised edge than a round O-ring, so when it flattens out after being tightened it will seal flatter than a standard O-ring. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

04-27-2007, 10:49 AM	#6
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: Sealing the thermostat housing... Thanks to Rickf for pointing the following out: The following message was sent to you via the The 1947 - Present Chevrolet & GMC Truck Message Board Network Contact Us form by rickf. -------------------------------- I was reading the faq and found the one about sealing a thermostat, whihc is a problem I am currently trying to solve. (Thread: http://www.67-72chevytrucks.com/vboa...ad.php?t=72077) The link in the thread no longer works, and the "magic gasket" is not directly named. It took a little while but I finally found on the federal-mogul page the name of the product line. I wanted to add it to the thread but apparantly I am not authorized to update the FAQ, according to the little box of permissions. The info is this: The gasket product line is called PermaDryPlus, by Fel-Pro. -------------------------------- Referring Page: http://www.67-72chevytrucks.com/vboard/faq.php IP Address: 24.20.83.71 User Name: rickf User ID: 21172 __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

10-10-2003, 04:58 PM	#4
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Cobalt, I have to agree those things are slick. I had a '74 with an old intake that I just couldn't get to seal. Switched to that, and it sealed like a charm every time. Brian

01-02-2004, 04:55 AM	#5
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,500	You can get them at the GM place too. They are not Felpro's but they are the same thing. I might add they work GREAT.



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