Norvel is a Russian engine company that has since gone defunct, over in the 1/2a forum are guys (myself included) trying anything to keep these engines alive, because there are no more parts being made and they are great engines...in my LMH I had 8 yes 8 head shims to lower the compression in my LMH and it ran great with plenty of power... havent run it in a while.. but it broke in fine and still has all 8 shims in it....I think the break in procedure was a big part of the problem ,,,we are used to OS engines that just start up and go and break in on the first flight.......Norvel made...049. .061. 074,.15,.25.40 engines for a short time, they are powerfull fast engines..Rog.
.they have said they are moving and retooling, but there is no way to verify this and it was stated a couple of years ago...