Block Deck Smoothness - Chevelle Tech
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post #1 of 25 (permalink) Old Aug 23rd, 19, 12:56 AM Thread Starter
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Bill
 
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Block Deck Smoothness

I just purchased a sleeved LS short block for my cylinder head guy. He ordered what I needed from a race shop and sent me that along with his heads. I got the block and am concerned about the surface of the deck. I can see a lot of the machining marks and my understanding is that MLS gaskets need a almost mirror-like finish. I called the race shop and they took my info (phone and email). I never got to send them a picture. The shop that I purchased from called me tonight and requested some pictures. He said it is not uncommon to see this on aluminum. When the cutter picks up iron from the sleeve it can drag some of it over the aluminum. He said he deals with this by using a long sanding board and 350 wet/dry to go over the deck. I don't like that idea! I really want to find a local shop with a profilometer. Is is possible for anyone to make a determination on this based on these pictures?
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post #2 of 25 (permalink) Old Aug 23rd, 19, 1:28 AM
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Re: Block Deck Smoothness

That finish is not acceptable for MLS gaskets not really anything I would accept for a finish today regardless of application,,,,,,,,,,,

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post #3 of 25 (permalink) Old Aug 23rd, 19, 7:12 AM
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Mr Bill
 
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Re: Block Deck Smoothness

I have to agree with Mike. That finish is not the best for modern gaskets. He is correct about sometimes having some problems with iron sleeves in aluminum blocks but that is not the issue with the block in your pictures.

That being said . . . if you ever looked at the finish on some of the factory LS blocks you would cringe But they seem to work pretty good.

Bill Koustenis
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post #4 of 25 (permalink) Old Aug 23rd, 19, 8:15 AM
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Re: Block Deck Smoothness

If you can feel it with your fingernail, it might have issues sealing. MLS gaskets do have some sealing compound applied to them, but don't think it would seal those ridges.

I normally go with a straight edge, good quality 3M 220 grit paper, and wd40. Run light easy 8's over the surface and never had a problem. 4 LS's done this way, one turbo'd, still trucking.

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post #5 of 25 (permalink) Old Aug 23rd, 19, 9:10 AM
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Re: Block Deck Smoothness

MLS wants flat more than smooth but I wouldn't be happy with that at all.

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post #6 of 25 (permalink) Old Aug 23rd, 19, 4:59 PM Thread Starter
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Re: Block Deck Smoothness

Thank you all for your responses. Hopefully you can answer another question. Is there any chance I can rectify this at home with a sanding board?
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post #7 of 25 (permalink) Old Aug 23rd, 19, 7:45 PM
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Mr Bill
 
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Re: Block Deck Smoothness

Quote:
Originally Posted by Bill70 View Post
Thank you all for your responses. Hopefully you can answer another question. Is there any chance I can rectify this at home with a sanding board?

Probably not. If you are going to use anything use a 2"x6" knife sharpening stone with WD40 A "sanding board" is simply not flat enough to give a flat surface.



To be honest with you it will probably be fine the way it is even though it is not ideal. I have a Fel Pro surface comparator floating around somewhere. I will see if I can find it and take a picture of the lower Ra areas so you can see them.



A lot of it is also going to depend on what the intended application of the engine will be. If it is a stock engine it will probably be fine. Race engine with a ProCharger .... I would have it surfaced correctly.

Bill Koustenis
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post #8 of 25 (permalink) Old Aug 24th, 19, 9:42 AM Thread Starter
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Re: Block Deck Smoothness

I would like to see pictures of various Ra finishes. Thank you. BTW this is a higher hp N/A 434.
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post #9 of 25 (permalink) Old Aug 24th, 19, 10:33 AM
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Re: Block Deck Smoothness

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Originally Posted by BillK View Post
Probably not. If you are going to use anything use a 2"x6" knife sharpening stone with WD40 A "sanding board" is simply not flat enough to give a flat surface.

To be honest with you it will probably be fine the way it is even though it is not ideal. fine.
I would go over it with WD40 and a stone like this :




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post #10 of 25 (permalink) Old Aug 24th, 19, 3:42 PM
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Re: Block Deck Smoothness

What did they use to deck that?

A circular saw?

I bet if you use some Indian head gasket shellac it will seal.

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post #11 of 25 (permalink) Old Aug 24th, 19, 6:15 PM
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Re: Block Deck Smoothness

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Originally Posted by fishhead View Post
What did they use to deck that?

A circular saw?

I bet if you use some Indian head gasket shellac it will seal.

Forever.
I am curious myself

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post #12 of 25 (permalink) Old Aug 24th, 19, 9:46 PM
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Re: Block Deck Smoothness

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Originally Posted by fishhead View Post
What did they use to deck that?

A circular saw?

They have an old school milling machine with a multi tooth carbide cutter head. That is the type of head that my Berco came with and it worked absolutely fine for old school composition gaskets. You could actually get a better finish if you slowed down the feed. On aluminum it would actually do pretty darn good because you could turn up the rpm too. We converted ours to CBN many years ago and have not looked back since.

Bill Koustenis
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post #13 of 25 (permalink) Old Aug 24th, 19, 9:48 PM
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Re: Block Deck Smoothness

Quote:
Originally Posted by nashville beth View Post

That is exactly what I have at the shop. Use it to touch up aluminum head surfaces like the intake and exhaust sides. It is very good for showing up low spots on the head gasket surface also.
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post #14 of 25 (permalink) Old Aug 24th, 19, 11:52 PM Thread Starter
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Bill
 
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Re: Block Deck Smoothness

Quote:
Originally Posted by fishhead View Post
What did they use to deck that?

A circular saw?

I bet if you use some Indian head gasket shellac it will seal.

Forever.
Not sure. Also not willing to use any extra sealers than what's on the gasket.
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post #15 of 25 (permalink) Old Aug 25th, 19, 8:18 AM
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Re: Block Deck Smoothness

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Originally Posted by Bill70 View Post
Not sure. Also not willing to use any extra sealers than what's on the gasket.
I understand, I was being sarcastic.


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