Hercules Engines, Inc.
LD-465-1, LD-465-1C, LDT-465-1C, LDT-465-1D
full load - 2650rpm
no load - 2900rpm
(From TM 9-2320-361-20, chapter 1, page 32)
or
LDS-465-1
no load - 2850-2900rpm
(From the LDS Troobleshooting Manual, page 11)
Both manuals are in resources section. The diff from 2900...