balance ?

If that is the case, what is wrong with a 360 to start with? There are plenty of them around, perhaps moreso than 318s

Yep....a lot easier for sure! Not many 360's pop up around here though. The most popular performance engine builder in our area needed a 360 a while back, and couldn't find one. I traded him a 360 I had laying around for a balance job on my next rotating assembly that I will need before long. I have a ton of 318's, and might even do one of the 340's I have hoarded up....lol.