HEI Compression Test Question

[TJUCLA98]

Originally Posted by geezer#99

Get a timing light and set your initial at 14. Plug off the vac advance when you set it.
Your idle will increase, so turn it back down and adjust your mix screw. Then hook your vac hose back up.
14 is a start point. You might end up a few degrees higher.

From what I can see on the tab, the furthest I can get a read appears to be 10 degrees advanced. I will try to set the timing slightly ahead of 10 degrees to see what it does - thanks.