I did use the 40mm gasket, because the new one had air leaks like a sieve. Yeah I'm def. going to stick the solder in tonight and see what's going in there. If it's not hitting, I'll pull the head and check the gasket and see if that's it. If not either, I'll know it's just the ringing of the kit/aluminum. The kit in this video is the same one I put on and sounds just like it (at 1:20).