The VHM pistons have a radius like the orange corner.
But in answer to the squish questions, the head should follow the piston shape ie dead flat with no taper except a tiny divergence of just 0.1mm.
As I discovered with a flat top the piston will hit the squish inner edge first if running real close to clipping at peak rpm.
And as i have already said several times, in my testing a flat top is completely useless without a toroidal chamber.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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