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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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