Home › Forum › Ask A Member › 9.9 Johnson Carb Question › Re: 9.9 Johnson Carb Question
June 21, 2017 at 9:28 pm
#60094
The 74-75-76 head have issues if low speed is desirable. The later heads are lower compression, have a charge deflector to protect the plug from fuel spray. I just bought a 89 head for my 76 to improve low speed. Those heads do not have that cooling jacket around the plug like past years. I will have to mod the cowl to clear the thermostat though..