Quote:
Originally Posted by Tomguy
Retarding the timing by 12 degrees will hurt your MPG and your high-end power. Keep in mind that when those cylinders are firing at 6000 RPM, it takes the fuel just as long to burn as it does at 600, so it needs to be ignited much sooner.
Does your distributor's centrifugal advance seem functional? You should be able to turn the distributor rotor clockwise. It will then "snap" back to the original position. If one (or both) of those doesn't happen the mechanism is likely bound up, meaning you're not getting the 45 BTDC needed at 4500 RPM (If memory serves for both of those values) and as a result, you're going to be eating gas.
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Rotor seemed to work as you described.
I drove on the 5atdc this morning. Felt awful, extremely sluggish at low speeds. Got some coffee, drove it home and the drive home felt similar to 7btdc again.
(clocked my mpg for a 40 mile freeway drive with a little bit of town and got 12.75).
Got pertronix in tonight no problem, will do valves this weekend.