Block prep for new head gasket - Quick answers appreciated. - Team Camaro Tech
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post #1 of 21 (permalink) Old Mar 18th, 17, 07:54 PM Thread Starter
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Bruce
 
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Block prep for new head gasket - Quick answers appreciated.

I'm going with a steel shim head gasket to increase compression. I know some say no, but it's what was on it for the last 50 years.

Prepping the block - I see the indentations in the block from the sealing rings on the original steel shim head gasket.

How is the top of the block best cleaned, and do I have to worry about those indents on the block??

Edit, tips on cleaning out the crud from the cylinders? I was going to vacuum them out, use a dental pick if needed.

Hope to get the heads back on tomorrow so any quickie answers appreciated.
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post #2 of 21 (permalink) Old Mar 19th, 17, 05:15 AM
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Re: Block prep for new head gasket - Quick answers appreciated.

I always stuffed the cylinders with rags and used a razor blade scraper if necessary, air hose or vacuum . then wiped it down with a rag soaked with carb cleaner
I then used plain ol aluminum spray paint to paint the steel head gasket

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post #3 of 21 (permalink) Old Mar 19th, 17, 05:46 AM
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Re: Block prep for new head gasket - Quick answers appreciated.

Spray paint is too thin for me. I use Permatex Indian Head Shellac with brush on block , heads and gasket.

Don
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post #4 of 21 (permalink) Old Mar 19th, 17, 07:42 AM
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Re: Block prep for new head gasket - Quick answers appreciated.

I remove the dowel pins
Then buy a new WD40 can and a NEW Norton honing stone, like you use for your knife sharpening.
Spray decks and heads with WD40 and use the new stone for 'polishing' the decks.
Then install the dowel pins and shim gaskets dry and retorque after break-in if iron heads or wait till to the next day and retorque with alum heads.
Permatex #2 for head bolts.

But, I am not a professional engine builder, but the above has worked for me.

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post #5 of 21 (permalink) Old Mar 19th, 17, 12:59 PM
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Re: Block prep for new head gasket - Quick answers appreciated.

I used a felpro coated steel shim on my rebuild and it leaked coolant. Your deck surface needs to be smooth enough for it to seal. If your deck surface isn't smooth and flat I'd use another gasket. If you insist on using the steel shim, some people use permatex cooper coat to help seal the gasket.

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post #6 of 21 (permalink) Old Mar 19th, 17, 01:22 PM
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Re: Block prep for new head gasket - Quick answers appreciated.

Quote:
Originally Posted by Everett#2390 View Post
I remove the dowel pins
Then buy a new WD40 can and a NEW Norton honing stone, like you use for your knife sharpening.
Spray decks and heads with WD40 and use the new stone for 'polishing' the decks.
Then install the dowel pins and shim gaskets dry and retorque after break-in if iron heads or wait till to the next day and retorque with alum heads.
Permatex #2 for head bolts.

But, I am not a professional engine builder, but the above has worked for me.
Just out of curiosity, what grit stone do you use Everett?


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post #7 of 21 (permalink) Old Mar 19th, 17, 03:17 PM Thread Starter
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Re: Block prep for new head gasket - Quick answers appreciated.

Quote:
Originally Posted by DenRS View Post
I used a felpro coated steel shim on my rebuild and it leaked coolant. Your deck surface needs to be smooth enough for it to seal. If your deck surface isn't smooth and flat I'd use another gasket. If you insist on using the steel shim, some people use permatex cooper coat to help seal the gasket.
Thanks for the input everyone. Leaking is obviously a concern, but I really wanted the higher compression. I know a lot of people use the copper coating, but Felpro says not to. I've never heard of anyone saying that the copper coating screwed things up for them.

I saw a mechanic on youtube that showed how he uses a flat sanding block, I like that idea, it would knock down any high spots while cleaning everything.
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post #8 of 21 (permalink) Old Mar 19th, 17, 03:43 PM
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Re: Block prep for new head gasket - Quick answers appreciated.

I used Fel-Pro 7733SH1 head gaskets with no paint spraying along with Permatex 2 on all head bolt and intake bolt threads.

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post #9 of 21 (permalink) Old Mar 19th, 17, 05:32 PM
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Re: Block prep for new head gasket - Quick answers appreciated.

I saw a mechanic on youtube that showed how he uses a flat sanding block
maybe a dumb question, but if this is not a bare block, where does the grit go

sound track of my 68 383

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post #10 of 21 (permalink) Old Mar 19th, 17, 06:20 PM
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Re: Block prep for new head gasket - Quick answers appreciated.

Quote:
Originally Posted by flat tire View Post
I saw a mechanic on youtube that showed how he uses a flat sanding block
maybe a dumb question, but if this is not a bare block, where does the grit go
If the block is on a motor stand, turn the cly head facing the ground and sand, particles should fall to earth. Otherwise plug holes with damp towels and sand. Magnets?

Don
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post #11 of 21 (permalink) Old Mar 19th, 17, 08:38 PM
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Re: Block prep for new head gasket - Quick answers appreciated.

Use the Victor .026 Head gaskets---you will be alot better off----I tried the .015 steel shim gaskets and both sides seeped---I used a stone with WD-40 on block and heads, also used the copper spray on the gaskets. The Victor gaskets seal alot better and you will never notice the .026 vs .015

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post #12 of 21 (permalink) Old Mar 19th, 17, 09:23 PM Thread Starter
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Re: Block prep for new head gasket - Quick answers appreciated.

Quote:
Originally Posted by flat tire View Post
I saw a mechanic on youtube that showed how he uses a flat sanding block
maybe a dumb question, but if this is not a bare block, where does the grit go
That is a big concern. I was going to vacuum everything after.
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post #13 of 21 (permalink) Old Mar 20th, 17, 06:58 AM
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Re: Block prep for new head gasket - Quick answers appreciated.

I would not go with the shim gasket. The small increase in compression is not worth the risk of the head gasket leaking.

You said you see the indentations from the old head gasket. That's reason #1 not to try a new one unless you deck the block which is next to impossible by hand.
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post #14 of 21 (permalink) Old Mar 20th, 17, 06:50 PM Thread Starter
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Re: Block prep for new head gasket - Quick answers appreciated.

I may do just that. The original plan was use the steel shim (most report excellent results with it) because I was going to go with a hotter cam. I've dialed down the cam, so I guess I can dial down the compression.

Just going by memory here, but it was more than just a small increase in compression. It was going up almost a full point to 10:1.

I may look into the GM performance head gasket, I think they have one about .029 or something like that.
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post #15 of 21 (permalink) Old Mar 20th, 17, 07:26 PM
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Re: Block prep for new head gasket - Quick answers appreciated.

The diff in head gasket thickness will not yield a full point on compression. My calculator with a zero deck show 1/3 of a point between a .16 and a .039 head gasket
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