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One method of "surfacing" a cylinder head is to use a belt sander machine, it is crude but if they only took off a couple thousands then it won't cause any problems. If you have a large enough surface plate you can lap the head surface for a smoother finish. Depending on the head gasket you should be fine. A better way to surface a head is with a mill and a flycutting head.
One thing you can do is, if you have a die grinder, use a small carbide cutter in the water passages to smooth them out, remove very little material. If you don't have a die grinder than a rat tail file and a little elbow grease will do it. Use compressed air to blow out the head water passages afterwards.
Have a good one.
 

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One thing I would be worried about it how much did they shorten the cylinder case to have removed the chamfer. You will need to install the pistons to the rods and crank and measure how far down in the cylinder they are at TDC. You want a few thousands down or flush, but absolutely follow the service manual. Including the head gasket thickness you need enough clearance from the piston crown to the head so they can NEVER make contact. I built two-cycle racing engines a long time ago and High performance Chevy V8s more recently, You need to measure everything when assembling, even if it is a trusted shop.
 
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