Does anyone have a soource for the self stick foam that is used to seal the ductwork under the hood? Does GM still use it??

t

You can get a comparable product at Loews or Home Depot

I use the same stuff the HVAC mechanics use. Known as "Rubatex" also called "elastromeric insulation". It's about 1/8" thick, 2" wide and is a black dense foam rubber duct work sealer, with adhesive on one side. Comes in a 30' roll for about 10 bucks. As Tom mentioned, can be found at Lowes, Homeless Depot, or any plumbing supply house.