Flow numbers on 600/650L heads? Chamber reshaping?

Does anyone have the cylinder head flow numbers from 600/650L heads? Both dual carb and single would be good.

Also, has anyone considered welding and reshaping the combustion chamber to actually create some quench? I hear people talk about the quench on these engines and let me tell you, I don't see a quench area. My reasoning behind this is to make it more ping resistant while raising the compression and maybe even making the chamber more efficient.

No one? Stepho, I'm looking at you....

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