COMP Cams Evolution HCT (Hydraulic Cartridge Technology) is their newest patented lifter. They've taken the same modern hydraulic lifter "cartridge" that is used on many current day OEM engines, and made a "blank" roller body to hold the cartridge. Check the additional pictures to get a visual idea of how this works. The cartridge design also allows for an incredibly stiff lifter body, greatly reducing body distortion and further ensuring consistent hydraulic performance. Comp has told us that they've tested the cartidges to 11,000 rpm without any valve float, which far surpasses anything else currently on the market for the Big Block Mopar.

This self-contained hydraulic cartridge and accompanying reduced oil volume delivers the most consistent bleed rates between each lifter. The smaller volume within the hydraulic cartridge creates one of the most responsive and quietest lifters on the market. Startup noise is greatly reduced and a precision controlled bleed down rate ensure excellent performance at high RPM. The patented cartridge design also allows for an incredibly stiff lifter body, greatly reducing body distortion and further ensuring consistent hydraulic performance. This patented HCT tappet is not just a performance Original Equipment replacement. This is an all new bespoke design started from a blank canvas developed to meet the demanding performance and durability our customers desire. Also, as an industry first the hydraulic element of this patented lifter is serviceable, allowing anyone to rebuild their lifters in their own garage. 

The HCT and proprietary manufacturing processes of these lifters ensure precision and longevity that exceed any lifter on the market. Other features include increased duration and lift to the camshaft and two oiling features. And, since this is Comp we're talking about, you can be assured of two things: The product is 100% made in the USA, and the quality is second to none.

Seat height is 2.300"