Power Head, serial number 1560 (14?) As Raced.  Looks like it has new pistons and never ran.  #1 cylinder is stamped 2.148, #2 cylinder is marked 2.143.  Appears like it may be chrome bore or a very smooth hone job Cylinder head looks good.  The head is brass and has some work done to the combustion chamber.  The bracket and 3 studs on the exhaust ports do not appear to be correct.  You can see that one stud hole had been welded up.  There is also another welded spot at the bottom of the block.  There is a brass brazing weld, top of block.;  It goes across the top of the block and down each sideways.  Crankcase, there is a weld around the carb mounting flange.  It looks maybe the entire flange was replaced.  Carb hole is 1 5/16.  I have no idea what was done inside so, look at the pictures.  This is about all I can tell you about it.p