i need help chosing a engine for this plane
i havea viper that im building and have two spare engines laying here. which should i put in. i have a os 50sx and a rossi53. which one would be better suited for this plane. the os has a macks tuned pipe. whic one do you think will make the viper faster? the rossi is used and the os is fairly new but has been in a crash but its totally cleaned and ready for action