Okay, not a machinist here, something seems a bit screwy. I had my heads resurfaced a long time ago by Napa. I got them back and the surface was nice and shiny, perfectly smoothe. I had another set of heads done recently by a performance shop Pro-Motor which a lot of people seem to like the place. When I dropped them off, he asked if they had been previously belt sanded. I didn't really think about it until I got the heads back and you could see the tooling lines. He used what appeared to be a CNC mill w/ a large-diameter round disk with the tooling mounted near the outside of it. Were the heads belt sanded smoothe before? I would assume this is not a good idea. One of my concerns is the machining lines can be felt w/ my thumbnail, is this going to be a problem? I did a little google image search and found both situations, anyone have any inseight on this?
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the reason the heads are off is a graphite head gasket failure, bought multilayered steel this time.
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