![]() To accommodate the change you must use valve spring shims under the bottom valve spring collar to make up for what you have lost at the valve seat-Ģ - how do I figure out which shims my head requires?įiguring out which valve spring shims you desire is solely based off of your application. O nce your valve starts to "sink" into the head your valve spring installed height begins to change. O ver time as your valve seat starts to wear (and from cutting seats) you're valve will begin to "sink" into the head. Let's answer a few questions that often come up regarding valve spring shims.ġ - why do I have to shim my valve springs? I have done some heads in my time but installing and figuring which valve spring shim you desire is a rather simple process which can make a big impact. I am not an "expert" when it comes down to valve train. Today's Tech Tip post I wanted to briefly touch base with you on is called valve spring shims or valve spring "boosters" and why you should use shims on your next top end rebuild rather that just installing or replacing your springs. The method of shimming valve springs dates all the way back to the turn of century when mechanics and tuners alike would try to retain the stock valve characteristics as much as possible. ![]()
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