The lifter problem was in some of the early engines. We have not had a problem, Burt and I have over 220 hours combined flight time the Verner 3V engines. No problem with lifters. Engine mounts are built that way for a reason, some of my early mounts did not last to long because of engine shake but we seem to have got pas that problem and working on a new design for 2 new installations, a LEXL and a WW I DH.2 Replica. See my blog for more pictures and details legaleagleflyingadventures.com