That’s a huge problem and you weren’t given all the right information. The first issue is that any solid or Hyd. lifter you get that come from a different manufacturer will have different depths and depth differences between the solid and Hyd. lifters themselves, from where the pushrod sits to the bottom of the lifter where it sits on the cam.
Second problem is in order to check for pushrod length on a Hyd. cam, you need to install checking valve springs. There super light designed to only keep the rocker up and not mess with the Hyd. lifters plunger but you should take serious note on what’s going on at the lifters plunger when measuring for pushrod length.
While there is a lot of forgiving room, being exact for a verity or reasons needs a careful eye and exacting lengths and specs.
If your running this for fun, and your not so super serious about every last HP, then a simple check rod expanded to depress the lifter approximately .050 will do. Or what ever you desire.
While this is less than perfect, the use of the OE stamped rockers are way less than right and a general measurement of the pushrod will do. I have gone this route and set the length to my desired route.
