70duster 360 gets hotter the faster i go

Aslo there are plenty of people running no Tstat on the street. With Electric pumps and without electric pumps. We also live in Cali where there is no real winter here.

Yeah that's a bad idea. Even in California. Unless maybe those people never drive when it's less than 70* out. Otherwise the lack of a thermostat will mean extended warm up times, and possible damage to temperature sensitive parts like the valvetrain. Just more wear and tear. And, why? Won't make more horsepower or run better without one.

The OP mentioned a Mr. Gasket thermostat? I had one of those that I couldn't use with my Air Gap, despite it being intended for a Mopar. The outer diameter of the thermostat was pretty much the same as the opening in the intake, so it would fall through and into the intake. Same for the housing, the relief in the housing was intended for a larger flange. You can use a gasket with a smaller opening to set it in there, but then the gasket is the only thing holding the t-stat. If the thermostat is moving around under higher flow volumes because the flange is too small of a diameter it could be causing a restriction.

This is the Mr. Gasket part that didn't fit...


Replaced it with this, same flange as the original design the intakes's and t-stat housings are made for...