I thought I was at 11.08:1 but when I found my notes I’m at a measured 11.20:1 and I’m getting thinner head gaskets to get to 11.66:1 on pump gas, but you have to have all your ducks in row to do it.
You MUST have your cooling system under control. You MUST have your carb tuned. You MUST have your advance curve correctly set. You cam MUST be selected with your final CR in mind. That doesn’t mean you need a big cam, it means you need the right cam. Which means it won’t come off the shelf.
If you aren’t willing to do all that, then 10:1, an actual measured 10:1, not some Mickey mouse on line deal where you add in values you haven’t actually measured is about where I’d stop.
Not using as much CR as you are capable of is a giant waste. Not of power, but efficiency. You lose expansion ratio with low CR. Among other things.
With a small block MoPar a dome is isn't a big deal. It’s not a small block chevy.
