I think they are flame retardant, mine has backfired a couple times and it never caught fire, although it did leave a discolored patch on the underside of the chrome top I have on mine.
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1942 Master Deluxe
1969 C/10
1985 Blazer CUCV
1987 Jimmy
2004 Tahoe
2005 Silverado 1500
2005 Silverado 3500
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