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H&H Machine is in Southern Cal, significant Model A experience
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I bought what turned out to be a H & H Engine at a swap meet about 10 years ago for $100. Turns out it had about 1/4" front to back play in the crank. Took it apart. They had machined away the trust bearing portion of the rear main rabbit, and installed a small split washer on the crank.
The small piece they had added as a thrust bearing had fallen off and ended up in the pan. I took it back to them and they wanted $250 to fix it (reinstall the thrust surface and turn the crank). I junked the engine.
They have changed this design in engines I now see at swap meets. New design looks better - -larger thrust area.
The pictures below don't surprise me.