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The way its done is with a spring seat micrometer ( you can also use a dial caliper ) that measures the installed height of the spring the # you get will be like 1.850, you than put spring and upper retainer in a rimac spring tester and you get the spring pounds installed, for the cams you are talking, about 100 to 120 lbs on the seat ?? dont have your cam specs, so to see what world might have speced the head out for their is an easy way to check that as well i see you are from north jersey i have all these tools ( IF ) you are mechanicaly inclined i can show you how and what to do ( i am not going to do it for you ) so the new cam you buy or have one of the lobes wont burn off on start up from to much spring pressure or retainer bottoming on the on the valve guide ----- please note if you are a mechanic and do your own work and just do not have the equiptment i can help i have a race shop and i am jammed with work but i was a young guy once with no help i know what its like jz
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