[quote
If you read what hughes says
"

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Well if Hughes says it then it must be correct...

I agree with John. The rocker arm shims are supposed to be used to get the correct rocker arm to valve geometry. After setting up the correct rocker arm so the tip sweeps over the center of the valve end, then you measure pushrod length for the correct lifter pre-load.

Now if you already have a pushrod that is too long, adding the rocker arm shims will reduce the lifter pre-load, but change the rocker arm sweep pattern over the valve.

You could go as far as reducing the length of the valves to reduce lifter pre-load, but that would again change the rocker arm sweep pattern over the valve.

The reason I mentioned the Ford pushrod is it was the length I needed, and because it is a standard replacement pushrod, not custom length, I was able to find some for under $50 compared to well over $150+ for custom length pushrods.