The problem is not with aluminum heads, per se, but with the head design on certain Ford engines. There's not enough threads to hold the plug into the head, and the plugs literally blow out of the engine. The platinum plugs themselves are fine for 100K, but they tend to blow out long before then.
Google "ford triton blown spark plug" for more info. I think the design problem was fixed in 2003.
When I remove spark plugs from aluminum heads, I like to first heat them using a brazing tip on my acetylene torch. They will usually come right out with no thread damage if you heat them up.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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