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Mine were back further than that, what you see in the above pictures includes a .030 shim under the shaft. I tried up to .045, but the .030 seem to provide a little less scrub.

You can get a better idea by trying to capture the pattern on the valve tip. I sometimes color the end of the valve with a marker to see the pattern but often times it will not show a good pattern because the check springs do not provide enough tension. I usually go and get a check that has the duplicate behind it, cut off a portion of it and use that, just be sure to run around the edges of the valve with a pencil while the paper is on the valve tip so that you can see where your pattern is in relation to perimeter of the circle (valve tip).

Here is a picture without any shims.



Thanks. The worse one that we had was a touch farther back than that, but I will talk to my engine builder tomorrow and tell him about the shims.

Thanks alot everybody, I apreciate the help and look forward to hearing any more suggestions.