[Mr 5 0]

catcher:

Quote:

so mr 5.0 running 94 with an advance in your opinion is better than running stock with 87 is that the general consensous


Absolutely. Been proven tens of thousands of times in street-driven Mustangs. Advancing the timing is a standard little engine 'modification' that's been around forever because it generally delivers good results if done correctly.

Using higher octane gas to compensate for possible detonation after advancing the initial timing is somewhat of a necessity. How high? You may well get by with 89 octane, or 92 or 93. Depends on a number of variables.

I just use Sunoco 94 out of personal preference based on good experience over time. I recommend it (with advanced timing) but it's certainly not mandatory. As I said, 92 or even lower octane might be fine.

For my engine's sake, I just don't care to experiment to see how low an octane I can get by with and not have a problem. As I said, this approach has always worked for me in my 5.0 and many other vehicles I've owned.

Of course, on a stock engine with factory advance (liike my wife's Mazda), I use good old 87 octane but I always buy name brands from a trusted station in my area.