I dont know bout this engine but on a ryobi it is 10 deg. the threads on a ryobi are also standard fine thread. it seems from some of the smaller poulans i have played with the taper and threads were the same. the mag and prop hub off my ryobi would also fit on any puolan and craftsman weedie.

I will have to bet the taper on yours is also 10 deg and the threads are gona be standard thread as they all semm to be the same.