Thought I would post this, I recently removed a 235 from my 53 truck, this engine was out of a 1956 -3 speed passenger car and indeed had a slinger in front of the crank gear when I disassembled it. This motor was a standard bore and I am the only one that has ever been inside that I could tell. I just re built a 261 from a 1962 C60 that was also never touched on the bottom end and it did not have a slinger or spacer.
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Last edited by sstock; 08/15/2019 3:00 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration