You can function test it with air, it’s all spelled out in that Tom hand book which is a great reference. I used it to do mine and it was very helpful.
Can any of you guys tell what valve springs these might be? Comp 901-16? They came out of a 360 that had a factory cam with 974 heads that had these different looking retainers. I would like to use them with a 340 build running a melling Spd-22. I also have access to a set of Hughes 1110p...