Check the listing for details. Johnson 2110R Drop-In Slow Leakdown Lifters with GM Trays for LS Engines LS1 LS3. Condition: New. Listed at 824.99 USD. Johnson 2110R Slow Leakdown Drop-in Lifters for LS EnginesIncludes 4 GM 12595365 Lifter Guide TraysThese are Johnson's slow leak down race-style lifters for all LS engines NOT running DOD/AFM. They do not use a link-bar, so you will still use the plastic guide trays.Hydraulic-RollerNo link bar.005" Shorter than LS7 Lifter.035" Recommended Pre-Load +-.010"Set of 16 LiftersMade in USA!We're proud to introduce a high quality alternative to the other drop in lifters that are available on the market, Johnson Slow Leakdown Rate (SLR) Drop In Lifters for LS Engines The Johnson Lifters® name has been known within the industry for over 50 years. In 1954 Johnson began producing millions of lifters for General Motors and thus laid the foundation for a credible name in the market. Johnson shifted their sights to the aftermarket business where cost isn’t everything and component integrity is! Their goal remains to produce the best lifter for the weekend warriors, street rods, and race enthusiasts. Features include: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.In late 2013 GM Performance went to Johnson Lifters to ask them what they had for their COPO LS engines. GM tested the Johnson 2110 lifters, GM LS7 lifters, Cadillac Racing lifters, and others to include those from Morel. GM took the lifters and put them through months of testing, and the Johnson lifters were the only ones that they had no issues with axle retention. Johnsons were repeatedly tested past 8,500 rpmSlow bleed-down lifter describes the ability to maintain lift without collapsing, or the repeatability in common rotation on the cam.If you had a .630” lift camshaft but your lifters bled down .030” as the lobe of the cam rotates, you essentially would only be getting .600” of lift from your camJohnson lifters maintained their lift 95% of the timeLS7 lifters only maintained their lift 50% of timeCold Start noise is commonly attributed to two main factors: High valve spring pressure, The high leak (bleed) down rate of the lifter (SLR lifters are actually a positive here)Johnson lifters have the largest inlet from low pressure (engine oil pressure) to high pressure (holds the load via the pushrod to from the rocker arm). Johnson uses the largest disc style check valve in the industry. Cold forged 1018 steel blanks CNC’d to final dimensions. Heat treated for exceptional wear resistance. Chosen over 8620 for roller pocket strength. The grain structure from forging increases the durability and dimensional repeatability in that area, which allows for an encapsulated roller versus an open fork design. The encapsulated rollers when used with standard GM diameter lifter will take higher spring loads than an open fork design. LS1 LS2 LS3 LS6 LM7 L33 LS7 LS9 LFA LSA LH6 LQ4 LQ9 L76 L92 L99 L96 LC9 LY6 LMG LH8