Difference between heads hyd flat vs roller

Brooks James said

I see that there may be differences between aftermarket heads for hydraulic roller vs flat tappet. What’s up with that ??

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Here is the porting I did. You can see how the push rod tubes interference. Opening them you have tobe very careful in the runners & in the tube. You can see them on the top of the whole head. The holes at the top close to the outside.