I have a question if anybody can help me but not about my prix. I am working on an LS1. Changing head gaskets to be specific. The owner sent the heads to get rebuilt. I'm not sure how smooth the surface should be but its a lot rougher than the block deck. it looks as if they used a large sander to do the resurfacing cause i can see and feel all the little scratches that a belt sander would leave. is this normal or should it be just like the block. its smooth but not when i run my nail perpendicular to the lines. can anybody help?