I sent a couple of e-mails about the engines. Don't know if you recieved them. The engines also had the biggest intake and exhaust valves I have ever personally seen, at least three inch head diameter one inch stems and were at least a foot long. On another subject I'm almost sure that one of the LCMs we carried had a reversing gear on at least one of the engines had a tag on it that said it was built by the Oliver Corp. Its been a long time so my memory may be playing tricks on me. The LCMs were built during or shortly after WWII.