Reply To: Thoughts please regarding installing new rings in 1964 3hp johnson.

[Dave Morrison]

I’ve got 5 of these Ev/Johnson 3 hp from 1952 to 1964 and none of them have more than 70 psi and several have 60, and they all run fine. The trick is to get the throttle down to Idle when the motor is actually idling. Some do . Some don’t. OMC Engine Tuner ( or similar) will usually get these idling better after 1 treatment.
So, I wouldn’t worry too much about the 60 psi .