[Dominik]

Hi Excaliber!
We made that experience a while back when the Chev LS7 was the toughest you can buy and tried the above resulting in "rattling like a bag of nuts". There are people here that can explain better the dynamics inside the head, but the proper quench initiates speedy flame travel.

The FE has a flat portion in the head, right?

Anyway, I guees you can make 11:1 work if you tweak all the minor options.
Is the car "above" build with ally heads? The Chevs benefit from bleed holes in the heads to reduce hot spots. So should the FE.

Fuel quality may also be different from gas station to station. It cold prove worth a while to shop around.

D