[hisgto]

Sun Tuned,

I was hoping you would be out there surfin' the boards. I have read a ton of your posts and printed a few for the garage, so thanks for sharing your test info and knowledge.

You understood me correctly that the springs were later removed. I only did this in an attempt to see if I was truly reaching full mechanical advance. It is comforting to hear this is inaccurate and the wrong way to measure, because that means I'm not getting 40* of advance at the crank.

The springs I used during my tests were from the Crane kit. One heavy (blue) and one medium (silver) per the instructions. After the testing I put on both heavy springs. Also, center cam IS numbers facing DOWN.

So with 15* initial and 20* mechanical I should be good at 35 total. But it pings when I jump on it. When I originally installed the Crane vac can, and followed the instructions to reduce initial timing until the WOT pinging stopped, I got down to 5* for a total of 25*. Seems low, but do I just set it where it likes it?

As far as vacuum advance is concerned, what should be my max vac advance?
When should it start and when should it be all in by?

Am I correct in understanding that a lean fuel mixture can also contribute to pinging?
Carb is Holley Avenger 670cfm out of the box stock. I'm a carb neophyte. Beyond float and idle mixture settings, I lack the bravado to make changes let alone understand it all.

Thanks again for your wisdom!

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