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If the oil band is above the lifter bore at full lift, you`ll hae low/no oil pressure.

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OK, whats the real deal on the hollow body rollers. Can you run them in a stock non bushed block or not? Are 400 blocks the only ones having problems or do 440's have problems also? Is it just big rollers? Is it just certain brands? How do you know if you have a problem? Can you prime the oil system with a drill and have someone else turn the engine at the same time and see it? Can you just see it by eye? Do they leak at the bottom or top? I have a set that I would like to use in a 440 with a .700 roller and the left side galley blocked, but I'm gun shy

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first of all I think that all solid roller lifters use a hollow body, at least all of the ones I seen, second as far as priming the engine and seeing the leaks you can install a mechanical oil gauge on the motor and prime the motor while you turn it over slowly, when the guilty lifters, if any leak, reach the top of there travel the oil pressure will drop I have ran a lot of different brand, sizes and shapes of solid roller lifters in all the big block blocks, early, late, hemi, B and RB. One Hemi block leak on the drivers side on a big Crane (.800+ lift at the retainers, 292 and 296 @ .050))roller cam. As far as where they leak they leak at peak lift, try yours first of course and use them if they don't loose oil pressure on the stand. There are several cures, the easyest is swapping lifters to a brand that have the long skirt on the oil galley side to block the oil galley off at high lift, another is to use a small base circle cam, not my favorite method due to spring pressures and cam deflection at high lift and high rpms The best and most expensive way is to bush the block BTW, my 400 block street motor had the Mopar brand skirted solid roller lifters in it and they work great, .720 net lift at the retainers