Adam Suess
Member
I have a 1855 with some what odd block. It is a cooler block but has none of the relief valves in it. It's not even drilled for them. It has a small 1/8" pipe plug with nothing behind it where the main galley relief would be and the block is not even drilled for the filter or oil cooler bypass relief valves. engine serial # 384243. Casting #'s A221520H The A and H are stamped the numbers are cast. Below that is 166101A and below that 422. This block came from a 1855 with a oil cooler and appears to have been green from new. Nothing special about the filter or cooler housing. It runs 70-85 psi oil pressure cold at idle. What do I have? What do I need to do to make this engine good to use? Thanks