SO the good news is Don Hardy race engines --- an LS specialist is right there near you. That's who built the motor in the '33 --- and where Brizio gets most of his motors.
My guess on the rich condition is a pin hole or leak in the exhaust UPSTREAM from the O2 sensor - causing it to add fuel to overcome what it sees as a lean condition. Or perhaps that valve never sealed well --- and unburnt fuel is oxygen rich again fooling the sensor.
Hey! You've only gone thru ONE motor --- the Mustang has eaten 4 since I've owned it.... LOL
|