Solid roller lifters...

@Bewy

- don't know where this nonsense about bushing lifter bores comes from. I presume you are using a used block & it provided 000s of miles of trouble free running with the existing bores.

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As cast OE blocks do not have the straightest in line and angled lifter bores. After machine shop work correcting them to as close to perfect as possible for use with high lift cams, the lifter bores can be bushed when very high lift cams intended for high rpm’s is being sought.

Some lifters oil bands will pop up out of the bores causing low oil pressure. Also, the lifter bore bushing material has an oil hole drilled to re meter the oil for less oil for more control of the bleed rate of oil.

This has been a proven method of oil control and the correction of lifter angle.