Normally this type of limitation is prop/engine combination related due to harmonics. I'm not aware of any "engine only" limitations like this.
 
Sorry,I didn?t tell you, I have a Lycoming XIO-360 M1B with Hartzell constant speed propeller in my RV-8, did you hear about RPM limitations in it? Thanks

Pablo Fern?ndez
RV-8 LV-X-418
Rojas, BA
ARGENTINA