My 360 build.

QuickDart360 said
I used the KB107'S in my 360 and did not have any balance done! Many here will cringe but It was 14 years ago I was younger and very naive. Even thought when I got the KB's that they were just replacements. Engine is still running strong and always seemed smooth. Did get ring gap right LOL. I guess I got lucky.

LOL... well, all reports are that the factory balance range was not all that great... reportedly a range of + or - 25 to 30 grams. And the KB weight change in the 360 is a lot less of a change than for the 340 or 318; the stock 360 pistons were quite a bit lighter already than the others. Stock 360 bobweight is right around 2150 grams.... with the KB flat tops and stock rods, it changes to around 2078 grams.

Wyrmrider said
But the weight makes a big difference on how hisengine will respond and the compression height difference makes a big difference
DBL check your deck clearances and dome/ dish/ valve relief volumes and check proposed compression with a couple of gasket choices

The weight difference is not going to be all that big, but the compression change WILL be a big change. Those old stock pistons are sooo far down in the hole LOL