Morel MM7717 Drop-In LS7 Style Lifters Set for Chevrolet Gen III IV LS 4.8 5.3 5.7 6.0 6.2 - Previously 6504Arguably some of the best quality LS7 lifters for the money, the Morel 6504 "Drop In" lifters are all individually leak down tested and held to some to the tightest machining tolerances in the industry. These lifters are a direct replacement for the GM LS7 style lifter and are designed to install directly into the factory trays. An excellent upgrade to all Gen III and Gen IV style LS engines, but also compatible with Gen V LT applications as well.