I have a 1974 Big block and have put a shut-off valve in both heater hoses and it is so hot my wife keeps her feet on the seat because of the heat I have removed the seats and rugs and installed Dyna liner look for any Ideas?

 

Welcome to the forum.

Isthe heater producing the heat still? If it's not, then the only other thing you could do would be to put some type of heat reflecting insulation on the firewall and under the carpet in addition to the Dyna liner. Is the Dyna liner for heat or for sound?