What compression ratios do people usually run on 360-420bhp engines? I'm just building up an egnine at present so have the opportunity to get the pistons machined down.

Up till now I've been running 7.7:1 on a 4x4. With the new build and the ported head I'm wondering if it's still worth retaining the lowered compression or whether people run standard compression on much higher power outputs than was the case back when my current engine was built up 5 or 6 years back. What do people think?