I am rebuilding my 3.4 dohc and need to know where i can get shims. I had the heads redone and now I need the the proper procedure of putting the shims in.
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lifter shims
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Actually...when having the valves and seats ground, the distance between the tip of the valve and spring seat is increased. Without installing the shims, this increased distance can/will decrease valve seat pressure and in extreme conditions, can cause valve float. The shims are used between the valve spring and the head to make up for this difference so the springs are compressed to their recommended installed height, keeping the spring compressed at a certain pressure, which provides the necessary (as designed) seat pressure.
Granted, this difference may be only a few hundredths of an inch, but none the less, engineers spent alot of time calculating what was needed where for a reason.
Good Luck.
RED
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