Air is an effective insulator. This was recognized by the factory when they
introduced square asbestos spacers at each mounting screw to create a layer of
air between the asbestos footwell panels and the steel footwell itself. Can't
recall just off the top of my head but it was probably at the same time as the
muffler heat shield was introduced. Up to then the asbestos had been screwed
directly to the footwell.
The muffler heat shield would have been obtainable from BMC and retrofitted
anytime from the summer of 1961 on.
Peter
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