1939 buick special 40 starter motor bolt thread size

[Stig1964]

help needed,

can anyone tell me what the bolt/thread is used to attatch the starter motor to the bell housing please?

thanks in advance

Mike

 

[TODD]

7/16 inch dia-14 threads/inch x 1-1/4 inch long, cad plated, quantity (3)

with 7/16 split lock washer