MACE LASH ADJUSTER SET TO SUIT FORD BARRA 220 230 5.4L V8These Mace Engineering lash adjusters are precision manufactured to maintain precise valve timing under all operating conditions. A patented constant orifice metering valve provides precise oil metering to the overhead valvetrain, and longer plungers pistons provide increased bearing surfaces, resulting in longer life. Their check valves are light weight flat discs, allowing for higher speeds and more uniform operation than competitor lash adjusters.