Author Topic: Valve cover gaskets  (Read 222 times)

Offline dplotkin

  • CLC# 26299
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Valve cover gaskets
« on: October 01, 2017, 07:38:27 PM »
Who has the best valve cover gaskets?

Dan
56 Fleetwood
60 Buick Electra six window
61 Plymouth Savoy Ram Inducted 413 Superstock
62 Pontiac Bonneville Vista
63 Chevy Impala convertable
63 Ford Galaxie XL fastback
65 Corvette convertable 396
68 Chrysler New Yorker

Offline Bobby B

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  • Mendham, New Jersey
  • Name: Bob Bender
Re: Valve cover gaskets
« Reply #1 on: October 01, 2017, 07:49:23 PM »
Dan,
 I have had great luck with Fel-Pro and Best brand gaskets. Although there are so many types for valve covers, I find the best ones are still cork with a thin coat of Permatex #2, Aviation, or Gasgacinch on one side only (valve cover side) when installing. It keeps it lined up, sealed, and you can always remove it if you need to get back in there. In my opinion the Rubber ones suck, and wind up leaking, even if you tighten them evenly. They have modern cork ones that have a metal spacer where the bolts go to kind of act as a stop so you don't over tighten them and cause a leak. I always go easy, and snug them up later on, only if they leak. Some guys use silicone or RTV, but I've never had any luck with either. Lots of opinions on the subject I'm sure. Hope this Helps!
                                         Bobby
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH

Online Art Gardner CLC 23021

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Re: Valve cover gaskets
« Reply #2 on: October 02, 2017, 07:19:38 AM »
I only use Best brand.  Make sure the valve covers are straight and flat.  Hammer the areas around the holes back flat.  DON'T overtighten!
Art Gardner


1955 S60 Fleetwood sedan

Offline TJ Hopland

  • Posts: 6712
Re: Valve cover gaskets
« Reply #3 on: October 02, 2017, 09:22:08 AM »
I too have not had much luck with rubber and they don't make the metal/cork ones for many older apps so cork seems to be the way to go.    Like Art said check and repair around the holes, they are usually dented down.   
StPaul/Mpls, MN USA

73 Eldo convert w/FiTech EFI
75 Eldo rusty but trusty
80 Eldo Diesel
And other assorted stuff I keep buying for some reason

Offline dplotkin

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Re: Valve cover gaskets
« Reply #4 on: October 02, 2017, 12:10:10 PM »
Thank you gentlemen!

Dan
56 Fleetwood
60 Buick Electra six window
61 Plymouth Savoy Ram Inducted 413 Superstock
62 Pontiac Bonneville Vista
63 Chevy Impala convertable
63 Ford Galaxie XL fastback
65 Corvette convertable 396
68 Chrysler New Yorker

Online Art Gardner CLC 23021

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Re: Valve cover gaskets
« Reply #5 on: October 02, 2017, 01:05:27 PM »
I have once or twice also run into a situation where the replacement gaskets weren't quite thick enough and when you ran the screws down, a part of the cover hit the head and prevented the gasket from getting squeezed properly.  But that is unusual.
Art Gardner


1955 S60 Fleetwood sedan

Offline TJ Hopland

  • Posts: 6712
Re: Valve cover gaskets
« Reply #6 on: October 02, 2017, 01:24:09 PM »
There is something to that.   You can have crud like sillycone down in the holes so the bolts bottom out before they actually put pressure on the cover and gasket or you could have the wrong bolts.  One way to test for that problem is to test fit it without the gasket.   If all the bolts will snug up with no gasket then when you add the thickness of the gasket there should be plenty of clearance.

Regular bolts with regular flat washers don't stay tight.  Should be some sort of washer with teeth or better yet the type of bolt that has the toothed washer as part of the head.   If you can get the spreader washers to fit you application those help even out the pressure.   
StPaul/Mpls, MN USA

73 Eldo convert w/FiTech EFI
75 Eldo rusty but trusty
80 Eldo Diesel
And other assorted stuff I keep buying for some reason

Online Art Gardner CLC 23021

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Re: Valve cover gaskets
« Reply #7 on: October 02, 2017, 01:49:03 PM »
I will sometimes use blue thread locker on the screws to keep them from working loose. 
Art Gardner


1955 S60 Fleetwood sedan

Offline cadman56

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  • Name: Larry Blanchard
Re: Valve cover gaskets
« Reply #8 on: October 02, 2017, 03:51:28 PM »
To get to the valve covers on a 56 you have to remove a lot of stuff and worse with factory ac.  I clean both valve covers and heads with lacquer thinner.  And make sure the cover is flat as mentioned earlier.  After cleaning with lacquer thinner again I use gasket shellac on both side of the gasket.  I know it glues them down hard but then the valves on a 56 are non adjustable.  No leaks ever.  Larry
1956 Cadillac Coupe deVille (sold)
1956 Cadillac Convertible (sold)
1956 Cadillac Eldorado Seville
1967 Cadillac Eldorado (sold)
1968 Cadillac Convertible
1991 Cadillac Fleetwood Brougham dElegance
Larry Blanchard CLC #5820

Offline walt chomosh #23510

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Re: Valve cover gaskets
« Reply #9 on: October 06, 2017, 09:31:46 AM »
Dan,
  Both my son and I (both mechanics) have struggled sealing valve covers, both on cars and Harleys(panheads). That is, until we discovered Permatex's "the right stuff". Cost more then silicone but pretty much foolproof....it works...no leaks...walt...tulsa,ok