Similar to second situation....
My engine was rebuilt by the only professional engine rebuilder in Ottawa. At least they are the only ones that still do everything from disassembly to wash, magnaflux and machine shop work....all others ship out of town for piece work.
Well I picked up my engine and noticed that on the exhaust side two brand new brass (Allen key) plugs had been tightly installed each in the oil output and oil return port of the engine block ...perfectly glued in with thread sealer or plumber's cement......
When I asked the expert they told me I could use the ports for an oil filter at a later date if I wished to do so..... but could test run the engine as is........
....fortunately I had read enough caution and warning on the Stovebolt forum concerning the peculiarity of the 261 and that it could not be run without an external by pass line at the very least.
I am now going back to the Stovebolt forum to get ideas on how to resolve my manifold leaks........
Nothing like tapping the collective experience of all the old "Bowtie" mechanics.....
Bob C.
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Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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