OK, new question - I've read that when setting pushrod length on a hyd lifter engine, you should use a solid lifter to set the required length, order the pushrods then install the hyd lifters.
Heres my question - I went to get a single solid lifter and when compared to a hyd, the depth of the pushrod cup caught my eye. The cup is obviously lower in the lifter than in the hyd lifter. I've never messed with solid lifters before, so that was a surprise. So - how can you use a solid lifter when mocking up the pushrod length for use on a hyd lifter when the cup in the solid is lower (closer to the cam) than the hyd lifter that will be used.
Is it because when you get the proper length based on the solid, then install the pushrods and hyd lifters, set lash using the hyd lifters, the cup is supposed to be midway on its stroke in the lifter?

Again, not sure if my question is clear, but any help would be great, this is a new one for me.
Thanks guys

Take the hyd. lifter apart, shim the plunger so it cant move down, making it a solid, then use it to find pushrod length.

Thanks again 67RS502 - makes sense now