I talked a bit before about this topic, on the hood of my bus there is a foot and a half of snow, so I started up the old girl(bus) she wasnt nearly as nosiey out side in front, and inside was noticeably quiet inside. then I shovled off the snow, it was a difference . inside and out. this means Ill be insulating the hood this spring, as well as the firewall.
just something I to share with everyone. (motor is 444 dognose bluebird.