How much oil in primary on twin cam?

That depends entirely on the year and model.

'99-'05 touring models use 32 ounces, '06 and later touring models use 38 ounces, '99-'05 Dyna models use 26 ounces, '06 and later Dyna models use 32 ounces, '00-'05 Softail models use 26 ounces, '06 and later Softail models use 32 ounces.