Okay just trying to decide on what engine to put in my restored concept 30. I got both engines in a trade no idea about how old either is. One is an OS 32 looks like the older style with square head. The second is an Irvine 36, with a purple head and purple Carb if that helps. If anyone knows anything about this irvine let me know. I want the more powerfull of the 2 and reliable to put in this heli thanks

heres a link to the Irvine heli engine http://www.justengines.unseen.org/irvine.htm
its the 36 F1 on this page