318 camshaft timing question

Look at the chart. Even if it’s correct, and most of the time it’s not for several reasons, with the heavy spring you are adding 18 F’ing degrees at 3000.

So, if you start with just 12 initial you’ll have 30 degrees of timing at 3k. That’s too much. Plus you are dumping vacuum advance on it, and being a mechanic device it takes TIME for it to come off.

That’s why we keep saying what does the curve look like. Because it matters.

Use your timing light. And your tach. Plot the curve.