Exactly!!! Every cylinder head that comes loaded (complete) will have springs that have a 50/50 chance they will work with your cam and it’s needed pressures and rpm range. This is not always the case. In some cases, the loaded heads springs are mearly slammed together. This is often seen as bad valve jobs and various spring heights. Springs can be sensitive to there height. The higher the spring rate, the more sensitive it can be.
I took apart a set of Edelbrock heads. The valve job was passable. But the valve springs were .100 high. If it were .010 or so on these Hyd springs, I’d let it ride. But they weren’t.
Since I was setting up the head for roller cam springs.....
Everyone went in within .003
It’s just better all around to set things up yourself (or your machinist) from a bare head.
