Do I have to have this block re-machined???
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I was getting ready to put the heads on my iron 370, but I found a small scratch in the sealing surface from one of the cylindes to one of the coolant jackets right next to it. I can just barley feel it with my fingernail, and I'm planning on pushing a D1SC to its limits on this motor. I was planning on running the 5 layer GM MLS head gastkets, and from what I hear they need a pretty much perfect surface to seal. Does this sound like I will deffinatly need to have it machined? I'm hoping its not nescessary to have to send it back to be re-done, but if it needs to be done it needs to be done. ![Bang Head](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_banghead.gif)
This was from my camera phone, I will try to get a higher qualty pic but this shows where its at.
![](http://i36.tinypic.com/2vn3lt2.jpg)
![](http://i37.tinypic.com/2cxzqf4.jpg)
![Bang Head](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_banghead.gif)
This was from my camera phone, I will try to get a higher qualty pic but this shows where its at.
![](http://i36.tinypic.com/2vn3lt2.jpg)
![](http://i37.tinypic.com/2cxzqf4.jpg)
![](http://i37.tinypic.com/vwy9ux.jpg)
Last edited by BIG BAD BLACKSS; 10-06-2008 at 05:36 AM.
#2
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I for sure wouldn't run it. Just think how much static comprssion you'll be running and how much could blow through a lil scratch. You really want to pull it out later? Not a good sealing surface in my opinion. Mls hedgaskets don't have a lot of crush.
#4
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Gasket spray (sealer) might hold water pressure but it wont put up with cylinder pressure. You need a flat mating surface to properly seal the head gaslets and contain the cylinder pressure.
If it was my block I would deck it just to be on the safe side...
Tony
If it was my block I would deck it just to be on the safe side...
Tony
#6
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I got a quote of around $900 to have it torn down and resurfaced. I think I'm gonna throw it in my truck and have them take a look at it. I can just barely feel it with my nail, not a deep scratch at all, but I hate its location. Gonna have em look at it and give their opinion in a few days. Hopefully its not too bad. May switch to a graphite head gasket as I am pretty sure it would be ok with that type of gasket. The scratch is maybe as deep as a human hair or less I'd say.