as jmac said; its all about "cam" & combo, ive run 13;1comp on pump fuel 98(huge cam)ran fine. static comp is a starting point,which is used to work out dynamic comp. dynamic comp is what you need to work out (using cam specs).

So what would be the max safe dynamic CR that could be run on pump gas?

BIG CALL; as jmac explained earlier, heaps of things to take into consideration & heaps of testing.(very engine differs)

I'm interested to see what cr could be used.
Had A14 balanced at the beginning of the year and at he sametime bored it out to 60thou over. The engineering company checked the cr and wasn't feeling comfortable with running more than 10.8 static cr.
We ran the motor with 10.8 static on a 268 cam, bit even with the 280 we put in then they would not raise the cr. They actually had to lower it to het to 10.8.
The motor never pulled the way I expected, but is way more lively.
So the other day I decided to have the timing set on the dyno.
And to my suprice it's actually making maginally less than previously. Which made me think that the cr is way too low for the setup I've got.
Thinking of taking the motor apart again after the season closed to raise the cr proper.