Roller Lifter "oil hole" Q

[PKRWUD]

Originally posted by MiracleMax
I beleive that is edge orfice metering? so the area just below the orfice fills with pressurized oil and feeds the lifter. So the space between the machined surfaces becomes the oil cavity in the lifter bore. Shouldn't matter which way they go in.

This is correct. The "chamber" that is created by the groove in the lifter becomes pressurized as soon as the oil pressure comes up, so it really doesn't matter. That being said, I always install them with the hole pointing towards the lifter valley.

Take care,
-Chris