261 Question
 

Has anyone here ever tried to move the dowel on a 261 oil circuit? This weekend I bought what I thought was a '58 Viking 60 but when I got the title it said it was a '57 and so it still has the bypass oil filtration system instead of the full pressure system. I want to change this as it does have the plugged 1/2" ports on the block and the dowel is flush. BTW I hope you understand my confusion on the year as this truck does have 4 headlights.