View single post by Greg Fletcher
 Posted: 03-16-2007 03:59 pm
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Greg Fletcher

Joined: 03-11-2005
Location: Lake Nacimiento, California USA
Posts: 425
This topic comes up fairly often. Although not recommended, shims do come up to .150" and owners have used them without problems from what I've heard. I have also heard of owners getting customs shims made by a machinist in even larger sizes.

Alternately, it is possible to machine the cam towers about .060" or so to get into a smaller shim range. This has been done many times in the past without any issues I know about, and certainly has something to be said as a solution. Keep in mind that technically you are changing the cam center line angles, even it's ever so slightly, so my first inclination would be to fix the head by getting oversized valves to start with. Then again used JH cam towers are pretty common and it should be easy to fix at a later date when it needs to be done again.