Lucky 7 engine sealant sounds good. I'll give it a try if I can find some in the Phoenix area.
There must be other products though? Seems like Lucky 7 is the only RC nitro engine sealant.
So besides RTV, which sounds like not a good choice and Lucky 7 what is there?
I'm tempted to just put the engine back together without any sealant and just use Green Slime O-ring grease on all the O-rings.