I have been living at the doorsteps of HELL here in Florida with my 67 400 with A/C. I had aftermarket unmolded hood insulation for years, it fell apart and created more debris than it was worth on my intake manifold and valve covers. I ran without any hood insulation for nearly 7 years with no harm to my paint. However, I am going to try the correct Molded hood insulation, I expect it to hold up like todays cars insulation does.o
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