Base Timing Questions

Bewy said

VA is being confused with VS.
VA means vacuum advance & it is that pod on the side of the dist. So ign related.
VS refers to carburetion. Some Holley carbs [ & clones ] open the secondary throttle blades by using engine vacuum.
An engine with 12:1 comp ratio will need less idle & WOT timing than a 9:1 CR engine, all else being equal.

Click to expand...

Understood about needing less advance for higher compression set ups. I did a bunch of reading on this and it makes sense. Thank you.
Regarding VA vs VS was confused. For some reason I thought they required each other as a system not being independent of each other. I now realize that you can operate one and/or the other and they are independent…….