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These are Johnson's short travel slow leak down race-style lifters with axle oiling for all LS engines not running DOD/AFM. These do use a tie bar, so you will remove the plastic lifter trays for these lifters.

Hydraulic-Roller
Will Accommodate Higher Open Spring Pressures of 500+ lb.
.058" Total Plunger Travel
.035" Recommended Pre-Load +-.005"
Set of 16 Lifters