Spring Pressures. Solid roller lifter on a hyd roller cam.

moper said

It may also be an indication that the lifter bores are worn. It's more common than most think and the clearance between the bore and lifter body is very critical for the hydro lifters to work right.

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I thought about leaking down in the bores too. When I had it apart I ran the oil pump with my makita to look at just that. The lifters that were at full lift did have more oil around the top of the lifter than the ones on base circle... figured that might be normal cause of the proximity of the lifter oil band to the stupid counter bore at the lifter bore top. At the worst counter bore I have about .105 thou before the oil band is exposed.

I did look at that leakage in my 318 as well. That one has worn bores. Oil flowed out of the bores on the 318 much more than on this 360 block. The 318 has hyd flat tappets and runs great with an XE268H. By comparison I tend to want to believe the 360's lifter bores might be okay...I can't see the bottom of the bores but I did see some oil on the lobes while I was running the makita. If side load from pushrod angle is a problem with hyd rollers it certainly would eventually egg the lifter bore.