Blox Racing Lost Motion Assemblies Honda B/H Series Engines - BXPT-11300BLOX Racing LMA (Lost Motion Assembly) is a necessary upgrade when your OEM lost motion assembly has become old and worn and starts making clicking sounds. Although the OEM had introduced a better design in more recent engines, it is still not considered a cost effective replacement. BLOX Racings LMA kit is your cost effective and high performance solution when the factory pieces have become old and worn and, definitely when upgrading to high lift