Piston dome / valve pocket contouring Advice?
 

This is a really good question for the experts. I've noticed the JE's and some aftermarket pistons' dome shape and valve reliefs are very sharply, if not roughly machined out of the box.

If you look at the Mahles their dome shapes and valve reliefs are much more 'fluid' in contour and finish. I've built many performance non-Pcar engines and I was taught that you want to make the piston dome shape as smooth and as flowing as possible to eliminate sharp edges and hot spots. This is to minimize detonation and improve flame travel in the combustion process which will result in more power. The dome shape should resemble a 'river rock'.

The other school of thought is that you do want a rough, angular piston dome because that will create turbulance in the combustion chamber thereby increasing the chance of burning the mixture completely. This is especially true in a hemi-head design (like the Porsche) where there is no inherent turbulance because of the 'half grapfruit' shape of the combustion chamber.

I intend to use JE's in my 3.4 build because they will do a custom dome and compression ratio at my request but I'm concerned about the rough, angular dome machining.

Sound advice please.:)