Isky Red Zone Extreme bushed rollers in mine, .730" net lift, 700lbs open,......lash never changes. Idling at 1100 - 1200 for oil splash. Oil is changed 2x per year, depending on the cars use; clean oil is supposed to be the mail thing to stay on top of with a bushed lifter. I have another near new set of the Isky Red Zones with needle rollers with little dyno use only - I might send them to Isky for conversion, I wonder if there is a contact for this, hmmm. So far, so good  I asked them about converting mine from needle bearings to bushings a couple years ago and they said no problem. Costs around $700 IIRC. Thanks Chip, who is the best contact at Isky to contact? Ive done a few thousand kms on mine without issue. The Bullet roller Im using doesnt have super aggressive ramps/lobes', this is the key for a reliable mostly street, some strip mill. I want to say the guy I talked to was Richard? Not sure on that though.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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