As I'm pre-planning my next build, I'm really digging deep and trying to learn everything that I can in regards to proper valve train geometry.
I'll be running a Comp Cams XM278H cam with Comp Cams Pro-Magnum hydraulic lifters.
From everything that I've read, they say to use a solid lifter for setting up the geometry because a hydraulic lifter will deflect when it's not pumped full of oil. However, this raises a question.
If the pushrod cup on the solid lifter that is used isn't the exact same as the pushrod cup on the hydraulic lifter, will this give a different geometry than the pushrod cup on the hydraulic lifter?
Also, with a solid lifter you would obviously check the geometry at zero lash. However on hydraulic lifters you have a preload adjustment. Will a preloaded hydraulic lifter give a different geometry than a solid lifter set to zero lash?