That is where the numbers should be so
knowing that the high speed Speedster
had aluminum connecting rods that were
known to fail I would "speculate" you have
the remaining parts from a H Speedster
that had a catastrophic failure, a factory
replacement block, and possibly some
other factory replacement or parts
cannibalized from another motor. Or could
be somebody’s Hot Rod or competition
motor built to out perform the stock motors.
Not having all the correct parts takes away
from its historic as wall as its monetary
value but has no negative effect on the
enjoyment that you will get from running
one of these.