Exhaust pipe angle in MZ Motorcycles

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Hello, Do you know from factory documentation, what is the exhaust port angle? (here in ETZ 250 particularly, Check the attached photo). I took some rough measurement with simple tool I have and it is 62 degrees. So factory angle is plus minus in 60 degree area. Maybe you could help. It's hard to measure the value with every base in bad condition, so it's always better to stick to factory spec. If someone know, how it look in the rest of MZ cylinders, I will be grateful for any help.

[intr]

If no one have any data, I'll answer myself to all of you. I remembered that in newest ETZ manual there is technical drawing of ETZ 250 cylinder. I took it to cad and measured the values. They are close to what I took last time with rough angle meter. So I think I'll take 60 degrees as a reference value here and try to make new thread with this angle. You can test it yourself if you want

Regards,
Roman