I remember a strip run when I had a weak valve spring that caused me to float a valve in a 427 Chevy at about 8,300 RPMs, and that was with triple springs. That made a mighty big hole in that slug, and you should have seen what the slug hammering it back through the combustion chamber of the head did to that aluminum head. There was a whole lot of scrap going on during that expensive losing run. I have seen weak threads in a head allow a spark plug to blow out. It happens. But if an internal touching a plug is the cause of it jetisonning, well, rebuild time is coming very soon.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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