Fins give more surface area to collect or dissipate heat, but that heat needs to come from somewhere other than the chamber that its in. So, putting fins on the insert won't help, especially since the wall of the chamber is stainless steel which really doesn't conduct heat nearly as well as the aluminum insert would. The heat would be too slow coming from the outside of the body to the valve and through the steel/aluminum joint to the inner surface to make a difference.
Originally Posted by jolt00
Except for the Automag in front, its usually the man behind the equipment that counts.