Originally Posted by SuperRob
[quote=fast68plymouth]The heater circuit will also act as a bypass, provided there isn’t a closed heater control valve being used, and the core isn’t plugged.

Thanks. Yes, drilling the hole will be on the agenda. I was just surprised to find a housing without a bypass. A
Look at the BB pump housing, they bypass internally when the thermostat is closed scope grin

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)