keepin\' cool The engine bay for my Jimmy seems to be very hot compared to other trucks. The header gasket seems to be in tough shape, so I will replace that, but could there be other things adding to the heat problem? And speaking of headers, has anyone had any experience with header wrap or sleeves. Do they help significantly? Why does the wrap manufacturer state header warranties may be voided, do they concentrate the heat so much in the pipe that it weakens it. Thanks for your advice! Oops, I mean it's a 1977.