Rocker Arm help

Archeryguy02 said

I am not sure, I will look to see if its on the old invoice. I believe its all about installed height, but what I know is the stock type adjustable rockers that are on it currently line up great which should indicate the heads are a good copy of factory.

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Installed height has to do with the distance from the bottom of the valve spring retainer and the top of the valve spring seat with the valve closed. That has little to do with over all valve length, as depending upon the valve, the keeper groove can be a different heights on the same length valve. And different length valves can give you the same installed heights by cutting spring seats or installing shims under the springs.
It always amazes me how some let their machine shop pick out and install parts and the person having the engine built don’t know what they are. Do you know who made the valves and have a part number?