So I pulled off my heads to port them and was in the process of cleaning the block. I left a scratch in the block deck that I think is kind of deep (my fingernail stops in the scratch when I run it against the block). Here is a picture.


The other part I’m worried about is that the scratch is connecting the picton bore and the coolant pocket. When I try fingernail scratching the iron dry sleeve, I don’t feel a scratch meaning it stops right before the sleeve. What should I do? Or do I need to worry about it? I’m using MLS head gasket for 5.7L.

Let me know what you guys think and Thank You!

-Brian

 

I would put some oily rags in that cylinder and then carefully block sand it with some 400 grit. See if you can smooth it out and when you reassemble I would apply Hylomar to both sides of the gasket. Hylomar was developed for gas turbines and does a good job of sealing up small voids.