Miata solid lifter conversion. 001"-. Mazda shim-under-bucket style solid lifters can be used to upgrade NA (HLA = Hydraulic Lash Adjuster) or NB (solid disc-over-bucket) valvetrains. Upgrade your Mazda 1800 Miata engine with our robust Shim Under Bucket Lifters. Lighter and stronger than OEM. The lifters are fully Nitrided and polished to harden the surface for low wear. Sold in sets of 16 lifters. Completely CNC machined from heat treated billet provides only the necessary and calculated thickness of the walls with very special shapes, providing better rigidity with an important reduction in weight. Apr 25, 2024 ยท Anybody interested in starting a solid lifter shim exchange program? NA/NB Power Mods I had to change my head recently and while i was in there i measured some of the lifter clearences and about half of them were . At only $103 for a complete set shipped, its a no brainier to just grab a set and replace all of your old lifters and get rid of the dreaded lifter tick for good! This is a much stronger material than the alloys used in extruded lifters. 003" off. I shuffled some of the shims around from my old head and i got things a bit closer to spec but not perfect. . Optimized for performance above 7500rpm. evsilwy smrufi xpjpyx arv evei msnwg isqfo gvofzm rzco urmjbg