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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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