Putting insulation under the hood will make it run hotter. Removing the insulation under the hood of my Cougar lowered operating temps. In the summer I needed all the help I could get, living in the Sac Valley at the time. So I'd say use as little insulation as possible, or go without. I bought some DEI(?) heat insulating tape for my rear brake and fuel lines, works good. They make bigger pieces , it looks like. You could stick something like that under the hood.