Greetings all.
I am doing some research and trying to select an appropriate plug for my engine. I have a 360 smog motor in my car, with what I assume is a stock cam (I did not do the swap and have no idea what the engine internals are), edelbrock intake, carb and headers. So basically almost stock. Car came with autolite 64's in it.
I would like to put some NGK's in it, looking at the GR4 or GR5. I generally run 87 octane, and it seems a hotter plug would be appropriate for such a mild, low-compression motor. The FSM isn't much help in this matter with today's poor quality fuel and the different timing specs we are running. What do you guys think?
