Sealant instead of base gasket on bored cases ...

[FXDBI]

Just FYI  1800psi steam turbines only used triple boiled linseed oil on the 1/2 joint to help the seal. Fills the voids and sets.   Bob

[Hillside Motorcycle]

Copper-Coat spray by Permatex works VERY WELL.

[rbabos]

Copper-Coat spray by Permatex works VERY WELL.

Probably would for case halves but due to over spray there would need to be a bit of masking tape involved. You don't want it on the outer surface or inner, just the joint. I've only used it on some gaskets so far. Namely those leaky uneven Shovel rocker box things. For gaskets, it's the cats ass. While I've never done it, nor intend to , even cometic head gaskets get reused with a flash of Copper Coat.

[Don D]

Everybody has their own favorite goop. A to b and good to go.

[crock]

http://hylomar.com/warrick/wp-content/uploads/2013/10/Hylomar-Aerograde-version-11.pdf

They state it's the aviation version (certifications matter in that world) of 

http://hylomar.com/warrick/wp-content/uploads/2013/10/Hylomar-Universal-Blue-Issue-8.pdf

It's interesting because it doesn't harden and permits shift as the sealed components grow or shrink with temperature.

Can't believe how affordable it is
https://www.amazon.com/Hylomar-Aerograde-3-5-oz-Tube/dp/B00XLWV0HQ
/ref=sr_1_1?keywords=HYLOMAR+AEROGRADE+%28PL32%29&qid=1572958031&sr=8-1


https://www.amazon.com/Valco-Cincinnati-Hylomar-Gasket-Sealant/dp/B00CFH9GZG/ref=pd_bxgy_263_img_2/140-6097134-7994427?_encoding=UTF8&pd_rd_i=B00CFH9GZG&pd_rd_r=7ae9f171-1ce2-42b3-9692-e3a4ba643360&pd_rd_w=kMrcZ&pd_rd_wg=9eFXM&pf_rd_p=09627863-9889-4290-b90a-5e9f86682449&pf_rd_r=87GHXS2JQS1CJVEECRZD&psc=1&refRID=87GHXS2JQS1CJVEECRZD

[farmall]

While I've never done it, nor intend to , even cometic head gaskets get reused with a flash of Copper Coat.

I did it on a Shovelhead to make a weekend run long ago, and it lasted several years until the top end came down for normal maintenance. Gasket was blue Fel-Pro. I think it was this forum where I read there's a better copper spray but I don't recall the brand. 

[jmorton10]

When I was drag racing a monster stroker Shovel (5" stroke & 3 13/16 bore) 40 years ago I had solid copper head gaskets custom made for it so they wouldn't blow running massive doses of nitrous oxide.

I always sprayed them with coppercoat before the final assembly & never had a leak.

~John

[1workinman]

When I was drag racing a monster stroker Shovel (5" stroke & 3 13/16 bore) 40 years ago I had solid copper head gaskets custom made for it so they wouldn't blow running massive doses of nitrous oxide.

I always sprayed them with coppercoat before the final assembly & never had a leak.

~John

I never built a hd motor yet but years ago when I worked for GM as a line mechanic I used that sealer on head gaskets and never had a problem . I always liked the sealer because I never had any problems using it . I got tired of warranty work and my friends making a lot more money than me in the oil field so I moved on . Glad I did also

[jmorton10]

when I worked for GM as a line mechanic I used that sealer on head gaskets and never had a problem . I always liked the sealer because I never had any problems using it . I got tired of warranty work and my friends making a lot more money than me

I was also a flat/rate GM line mechanic for 10 years back in the day, that was my first job out of high school (in 1969).  Glad I got out of it also.

~John

[Don D]

Loctite product has some substance that actually takes up space. Very fine media in with the anaerobic gel.

[Hillside Motorcycle]

On our AHDRA Mod Class 108" bike, we ran neither a base gasket, or a cylinder head gasket.
Fact.

[rbabos]

On our AHDRA Mod Class 108" bike, we ran neither a base gasket, or a cylinder head gasket.
Fact.

No head gasket is actually not that uncommon. Air cooled VW had metal to metal. Early ones used a copper O ring but they did away with it later on.  On the Rotax I use to fly with, all it had was an O-ring for sealing, with metal to metal contact. Neither of these methods caused issues.
Ron

[PoorUB]

when I worked for GM as a line mechanic I used that sealer on head gaskets and never had a problem . I always liked the sealer because I never had any problems using it . I got tired of warranty work and my friends making a lot more money than me

I was also a flat/rate GM line mechanic for 10 years back in the day, that was my first job out of high school (in 1969).  Glad I got out of it also.

~John

A friend of mine is a life long GM mechanic. He is a great mechanic, and fast too. He also has a shop at home and also does work there. He works four ten hour days so he has three days off every week so he moonlights on his days off. 4-5 years ago the shop manager was giving him crap about his moonlighting and told him he had to quit working on the side. He didn't. Next thing he gets called up to the owner's office. The owner of the dealership told him if he didn't quit moonlighting he was fired. He told the owner he could not fire him, be cause he just quit, did he want two weeks notice? He still works there and still moonlights!

[Hillside Motorcycle]

On our AHDRA Mod Class 108" bike, we ran neither a base gasket, or a cylinder head gasket.
Fact.

No head gasket is actually not that uncommon. Air cooled VW had metal to metal. Early ones used a copper O ring but they did away with it later on.  On the Rotax I use to fly with, all it had was an O-ring for sealing, with metal to metal contact. Neither of these methods caused issues.
Ron

"Crush fit" on the heads, Ron.
I bought semi-finished cylinders, established a .038" firelip, and spun the STD heads in a Trock fixture, to have a .034" depth. .004" interference, and the head bolts drew the ductile iron lip, into the aluminum head.
Even at 17.25 cr, it never had an issue.

[rbabos]

On our AHDRA Mod Class 108" bike, we ran neither a base gasket, or a cylinder head gasket.
Fact.

No head gasket is actually not that uncommon. Air cooled VW had metal to metal. Early ones used a copper O ring but they did away with it later on.  On the Rotax I use to fly with, all it had was an O-ring for sealing, with metal to metal contact. Neither of these methods caused issues.
Ron

"Crush fit" on the heads, Ron.
I bought semi-finished cylinders, established a .038" firelip, and spun the STD heads in a Trock fixture, to have a .034" depth. .004" interference, and the head bolts drew the ductile iron lip, into the aluminum head.
Even at 17.25 cr, it never had an issue.

Yup. That's the method. Get the ring too narrow and it will slowly embed into the aluminum rather then  work the stretch studs as it should. Good to clear that up so the group don't start eliminating the gasket and trying to make the large flat surface work. 
Ron