These are Johnson's short travel slow leak down race-style lifters 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. 

Cold forged steel body heat treated for exceptional wear resistance.

• Precision ground needle roller bearing with high chromium steel axle for long life and minimal friction.

• Cold forged extra long piston, precision ground and fitted for controlled leak down and pump up.

• High flow disc style quick reacting check valve for better reaction at higher RPM.

• Precision oil metering assuring proper oiling to the rocker arms without sacrificing oil pressure. • Proprietary tie-bar system 

• Hydraulic-Roller
• .058" Total Plunger Travel
• .035" Recommended Pre-Load +-.005"
• Set of 16 Lifters

*Non-DOD Applications Only