Scratch on deck of ls2 block repair

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Jan 21, 2013 | 07:26 PM

#21

td1168

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From: Uniontown, Pa.

Sorry, that did sound a little stupid after reading it. I'm just trying to say that once the head is torqued with a good gasket and flat surfaces how is the combustion gases or coolant going to make their way to the nick unless the gasket didn't seal in the first place. You have good surface area on both sides of the nick.

Jan 21, 2013 | 07:52 PM

#22

SilkyJ

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Quote:

Originally Posted by td1168

Oh ok, I got ya. I plan on having the block decked before assembly, which isn't going to be in the very near future, and I hope that will get rid of most if the scratch.

What type of head gasket would be best to use?

Jan 21, 2013 | 08:16 PM

#23

badazz81z28

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Quote:

Originally Posted by td1168

Thats what I was curious about. If the lay the gasket on the surface, where is the O-ring in relation to the knick?

Jan 21, 2013 | 09:18 PM

#24

SilkyJ

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Quote:

Originally Posted by badazz81z28

Thats what I was curious about. If the lay the gasket on the surface, where is the O-ring in relation to the knick?

I don't have head gaskets yet.

Jan 21, 2013 | 09:34 PM

#25

LS1MCSS

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From: Dover, Arkansas

Fix it with this stuff. I have some of this and it works great. Weld it up and file it flat.

http://durafix.com/demo/256.html

Jan 22, 2013 | 06:34 AM

#26

Gordon0652

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It's really not that bad - but its not good. JB and file it down.

Jan 22, 2013 | 08:40 AM

#27

td1168

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From: Uniontown, Pa.

Quote:

Originally Posted by LS1MCSS

Fix it with this stuff. I have some of this and it works great. Weld it up and file it flat.

http://durafix.com/demo/256.html

Learn something new everyday. Thats what I love about getting on LS1Tech! Some really good info!

Jan 22, 2013 | 09:01 AM

#28

87silverbullet

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From: Slidell,LA

Instead of running an MLS gasket I would try to find a graphite gasket. It will seal that up when you torque the head down. Been there and done that on many other engines pretty much in naturally aspirated form. What is your intended usage of the block?

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Jan 22, 2013 | 09:27 AM

#29

SilkyJ

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Quote:

Originally Posted by 87silverbullet

I was wanting to build a 403, street use though.

Jan 22, 2013 | 10:15 AM

#30

87silverbullet

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From: Slidell,LA

Quote:

Originally Posted by SilkyJ

I was wanting to build a 403, street use though.

I don't know if that little bit of honing is going to affect it. If you are going to go N/A I say run it with a graphite gasket if possible. The fire ring should seal the chamber and let the graphite fill the nick.

Jan 22, 2013 | 11:19 AM

#31

Gunslinger09

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When the block is surfaced that tiny scratch will disapear.

Jan 22, 2013 | 11:26 AM

#32

TZ2884

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From: Sumter, SC

Edit...

Last edited by TZ2884; Jan 22, 2013 at 10:38 PM.

Jan 22, 2013 | 11:27 AM

#33

TZ2884

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Quote:

Originally Posted by Gunslinger09

When the block is surfaced that tiny scratch will disapear.

Sorry, I was typing when you replied. You answered my question.

Feb 13, 2013 | 03:41 PM

#34

SilkyJ

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Quote:

Originally Posted by Gunslinger09

When the block is surfaced that tiny scratch will disapear.

How much is normally removed when a block is resurfaced? How do you compensate for the amount of the deck that is removed?

Feb 13, 2013 | 05:09 PM

#35

87silverbullet

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From: Slidell,LA

Quote:

Originally Posted by SilkyJ

How much is normally removed when a block is resurfaced? How do you compensate for the amount of the deck that is removed?

The thickness of the gasket will compensate for that. You can get gaskets in all thicknesses. I have a .040 gasket on my motor. The stock gasket is .051. You can get .060 and thicker gaskets.

Feb 13, 2013 | 07:30 PM

#36

SilkyJ

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Quote:

Originally Posted by 87silverbullet

The thickness of the gasket will compensate for that. You can get gaskets in all thicknesses. I have a .040 gasket on my motor. The stock gasket is .051. You can get .060 and thicker gaskets.

Ok that makes sense.
This scratch is driving me crazy. I guess the plan now is to have it decked.
I'm curious about the cost of having it decked too.

Last edited by SilkyJ; Feb 13, 2013 at 09:11 PM.

Feb 13, 2013 | 09:10 PM

#37

SilkyJ

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I'm thinking of just doing a feeler thread to see how much I can get for the block. I don't really know any good local machinists. It's looking like it would make more sense to just buy a shortblock.

Feb 13, 2013 | 09:34 PM

#38

Exidous

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If you were to repair it. TIG and shaving down the deck a couple thou would be the only way to go. Unless you were to shave it far enough to where it was removed.

Feb 13, 2013 | 09:49 PM

#39

SilkyJ

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Quote:

Originally Posted by Exidous

If you were to repair it. TIG and shaving down the deck a couple thou would be the only way to go. Unless you were to shave it far enough to where it was removed.

The hope is that it can be shaved far enough to where it was removed.

Feb 14, 2013 | 08:00 AM

#40

87silverbullet

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From: Slidell,LA

Take it to a machinist and let them make a light clean up pass on it and see how it looks after that. I bet it a .002 pass takes more than half of it away. Its only like 40-50 bucks to deck it. Put a .055-.060 gasket and run it

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