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I purchased compcam kit k35-510-8 which comes with cam, springs, retainers, locks, lifters and timing set. I have a set of GT40 heads that I had completely reworked about 4 years ago in anticipation of installing them one day, which is here now. I'll be replacing the stamped rockers with Scorpion 1.6 rollers. Also will be replacing the existing springs with the Comp springs. After removing the springs I measured installed spring height with a valve spring height micrometer with no shims in place. As seen in the pics the range is from 1.755" to 1.775". I've mostly heard that 1.8" is the target installed height on GT40 heads. I spoke with Comp before I took measurements and asked what the height should be and I was told they recommend 1.750" with this kit. (I left the "1" out of the measurements) In an effort to make them closer to each other and the 1.750 target, I'm going to use .015 shims on the 1.775's and 1.770's to yield 1.760 and 1.755 on those eight and leave the others alone. Would really like some feedback before I do this..
That should work fine. You could also use a .030 on the ones that are about .025 high and have them be .005 tight. That would be ok too. The rate of the spring is probably low enough that it won't change the loads all that much. If the box has the loads on the end figure the rate and then multiply it by .030 to see how much it really changes. The advertised loads will be reasonably close to what the springs in the box actually measure.
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