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.
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2002 5M GT (99% stock)
1991 5M LX (30% stock)
patiently awaiting my satin silver 07 Mach 1, and don't forget the shaker
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