No preservative, Bo. But I will from now on. I'm really wondering about the new fuel supplier, whose name escapes me, we had at Loring this year. I asked for something equivalent to VP C-12, but i don't know what I got. I've never seen rust on my valve seats after tear downs in previous years (maybe I was just lucky). But the rust along with the blackened oil, which BTW hasn't changed color since I let it sit in the glass measuring cup for the last week or so. Could the gasoline have had some contributing additive? Oxygenated, perhaps?
In any case, I made a 5 hour round trip to Kingston, N.S. yesterday to get a proper valve job done. The exhaust valve has a slight bend in it, so naturally wasn't seating properly. That along with a slight ding in the intake valve has me worried about the new higher ratio rockers. I'm considering using the stock rocker for the exhaust along with the new one for the intake. If I need another mph, I can always put the new one back in in less than an hour.
Tom