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BIG BLOCK FORD

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Cometic Head Gaskets

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Post  geno October 10th 2013, 11:08 pm

I have never used cometic gaskets before. Pulled the heads and sent them to the machine shop to have them set up for the gaskets. I read that they are to be install dry but some have used copper spray. Do I spray or not. I just don't want to install them twice. Thanks in advance.
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Post  richter69 October 10th 2013, 11:09 pm

no spray, unless tney are used.
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Post  cool40 October 10th 2013, 11:40 pm

x2..and be sure the block is slick too.
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Post  powerstrokeace October 11th 2013, 1:08 am

cool40 wrote:x2..and be sure the block is slick too.
I think the heads and the block need a AR finish some where between 15-25AR smooth as glass.

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Post  466cj October 11th 2013, 11:48 am

50 AR or less. Think making sure heads and block are flat is more important.

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Post  Lem Evans October 11th 2013, 12:12 pm

powerstrokeace wrote:
cool40 wrote:x2..and be sure the block is slick too.
I think the heads and the block need a AR finish some where between 15-25AR smooth as glass.


Ace

Glass smooth is not required. The best way I know of saying it....a good job not a hatch job.Smile 

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Post  geno October 11th 2013, 7:17 pm

The heads are 50AR but the block is still in the car. Would I need to spray the block side of the gasket?
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Post  466cj October 11th 2013, 7:42 pm

long as it is flat I'd just run them dry.

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Post  powerstrokeace October 11th 2013, 9:28 pm

What surface finish is required to us an MLS head gasket?
A surface finish of 50 RA (roughness average) or finer, is recommended for a proper gasket seal. Anything rougher may conflict with the gasket design.

right off there web site

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Post  geno October 12th 2013, 9:05 am

Thank all for the needed advice. I will install the gaskets dry. Thanks again..
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Post  Lem Evans October 12th 2013, 9:56 am

Anyone know someone who has one of those RA measuring deals? I don't.

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Post  maverick October 12th 2013, 10:00 am

Lem Evans wrote:Anyone know someone who has one of those RA measuring deals? I don't.  
zemetrics.com
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Post  Lem Evans October 12th 2013, 10:04 am

I'm not looking to buy one.....the eyeball and thumb nail are working just fine for me:) Smile 

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Post  dfree383 October 12th 2013, 10:52 am

doesn't hurt to use some copper coat either.
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Post  Lem Evans October 12th 2013, 11:22 am

dfree383 wrote:doesn't hurt to use some copper coat either.
 
 
Yep, there are many engine builders that use the copper coat, even with the 'glass' finish that the CBN cutters can give. I don't really see the need for C.C. with a super slick finish but, I will say I'am yet to any downside to using it.

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Post  466cj October 13th 2013, 8:15 pm

dfree383 wrote:doesn't hurt to use some copper coat either.
Cooper coat after reused a few times, try to avoid it as is a pain to clean off. Halomar better if you can find it, just have to let it air dry a few minutes

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Post  IDT-572 October 14th 2013, 5:15 pm

Double post:oops: 


Last edited by IDT-572 on October 14th 2013, 5:17 pm; edited 1 time in total
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Post  IDT-572 October 14th 2013, 5:16 pm

Chrysler had a sealant that worked good too. I think it was for their 2.2 liter turbo four.
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