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Chevy1966 · 10-01-2017, 07:48 PM

Finally got around to pulling the heater box on my '76 to replace the core. As shown in the attached pics (and as expected) the 40 year old insulation behind the plenum assembly is garbage now. I am wondering what would be a good replacement using modern materials? Can't find any reference to this stuff anywhere. Any ideas?

10-01-2017, 07:48 PM	#1
Chevy1966 Registered User Join Date: Nov 2011 Location: San Luis Obispo, CA Posts: 198	Inside Firewall Insulation Finally got around to pulling the heater box on my '76 to replace the core. As shown in the attached pics (and as expected) the 40 year old insulation behind the plenum assembly is garbage now. I am wondering what would be a good replacement using modern materials? Can't find any reference to this stuff anywhere. Any ideas? Attached Images __________________ 66 Custom Camper 327 AC PS PB 66 C20 292 76 C25 Sierra Classic 76 C25 Sierra Grande 76 Camper Special 77 Sierra Grande 02 Suburban - the DD