Gasket questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

super72bb · 01-08-2005, 05:14 AM

Can anyone tell me...

On the new style gaskets that have an O-ring built into them do you need to use silicon or what is recommended? The gasket I am refering to is the thermostat housing.

Also I feel a little foolish asking this one but, on the exhaust manifolds I seem to remember always having the "flat side" of the gasket towards the head. However, I was told by a parts guy at a local parts store that it was the other way around with the flat side away from the head. It doesn't seem right for some reason. It has been a while and if the parts guy wasn't so sure about it, I am sure it wouldn't have come up. Can someone set me straight.

Thanks

Curt

Longhorn Man · 01-08-2005, 07:50 AM

rubber O ring is all you need, no additional sealing meathods are needed.
I always installed manifold gaskets metal side out to the manifold.

Super Duck · 01-08-2005, 08:07 AM

unless the housing is warped. wich does happen. if it is put a D.A. disk on a piece of glass and sand away.

68C15 · 01-08-2005, 09:36 AM

I do not like the O ring gaskets for anything involving coolant. the hot-cold thermal cycles will cause it to leak sooner than a good paper type gasket. even better yet Felpro has a therm gasket made of some kind of rubber over a plastic core. I dont know the # but they are around $8 IIRC.
as for the exhaust, DO NOT USE the run of the mill gaskets. go to the dealer & ask for exh gaskets for a '97 Chevy P30 step van with the 5.7 VIN R. it is a multiple layer stainless steel unit that will NEVER leak. these are not too spendy, but more than the leaky ones.

Mudder · 01-08-2005, 09:56 AM

I run the ole regular metallic gaskets with the little ears on my headers and havent had a leak since the early 90's. I put the silver side out. about 7 bucks.

**Stocker** · 01-08-2005, 12:45 PM

Quote:

Originally Posted by 68C15

Felpro has a therm gasket made of some kind of rubber over a plastic core. I dont know the # but they are around $8 IIRC.

Fel-Pro Perma-Dry Plus water outlet gasket #35562T

01-08-2005, 05:14 AM	#1
super72bb Senior Member Join Date: Jan 2002 Location: calgary,Alberta,Canada Posts: 387	Gasket questions Can anyone tell me... On the new style gaskets that have an O-ring built into them do you need to use silicon or what is recommended? The gasket I am refering to is the thermostat housing. Also I feel a little foolish asking this one but, on the exhaust manifolds I seem to remember always having the "flat side" of the gasket towards the head. However, I was told by a parts guy at a local parts store that it was the other way around with the flat side away from the head. It doesn't seem right for some reason. It has been a while and if the parts guy wasn't so sure about it, I am sure it wouldn't have come up. Can someone set me straight. Thanks Curt __________________ 1972 CHEYENNE SUPER SWB BLACK. 402 BB, TH400, AIR, TILT, TACH, BUCKETS, CRUISE, AM/FM, 8 TRACK. My build thread: http://67-72chevytrucks.com/vboard/s...=1#post7120181

01-08-2005, 09:36 AM	#4
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	I do not like the O ring gaskets for anything involving coolant. the hot-cold thermal cycles will cause it to leak sooner than a good paper type gasket. even better yet Felpro has a therm gasket made of some kind of rubber over a plastic core. I dont know the # but they are around $8 IIRC. as for the exhaust, DO NOT USE the run of the mill gaskets. go to the dealer & ask for exh gaskets for a '97 Chevy P30 step van with the 5.7 VIN R. it is a multiple layer stainless steel unit that will NEVER leak. these are not too spendy, but more than the leaky ones. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

01-08-2005, 07:50 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	rubber O ring is all you need, no additional sealing meathods are needed. I always installed manifold gaskets metal side out to the manifold.

01-08-2005, 08:07 AM	#3
Super Duck Chevy Nuttttt Join Date: Sep 2004 Location: Santa Maria Ca. Posts: 568	unless the housing is warped. wich does happen. if it is put a D.A. disk on a piece of glass and sand away. __________________ 67' Chev swb step side 69' SS elky 03' Chev ext cab 4X4 hey who lernt me to spell is there anything else?

01-08-2005, 09:56 AM	#5
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	I run the ole regular metallic gaskets with the little ears on my headers and havent had a leak since the early 90's. I put the silver side out. about 7 bucks.



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