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I had my heads done by a well known shop, too...equal to EBS, if not better. When i took the motor down again, i considered the guides fine. A few of my cylinders showed some wetness in the exhaust ports and there was smoking issues, leak down issues. Into the build -- or should I say the rebuild #2 -- I decide to get the new guides checked out. I was totally amazed to see them totally shot! They were ruined. I could not believe it. I saw this with my own eyes. I did not place blame but only learned from my adventure. This is a real issue that needs to be understood. It does make perfect sense. The guide only has a small middle portion that has the correct diameter when reamed, the rest of the guild becomes oversized, so the valve stems slap around and beat themselves out. The solution was to get undersized custom guides pressed in and then the the entire guide is reamed to spec. Cured! no problems, smooth as silk and runs better than ever.
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